group 17 elements

The iron wool is heated strongly until it is red-hot. Chemical reactivity of group 17 elements decreases down group 17 from top to bottom. Legal. (b) All halogens have low melting and boiling points. Reason: The molecular size of the halogens increases down the group. The hypothesis proposed can be accepted. The following safety precautions must be taken when handling these halogens. Trend of change in the physical properties. However, some of the physical properties mentioned above vary gradually when going down Group 17, as shown in Table. The liberated iodine vapour is passed over the red-hot iron wool until no further change occurs. Filed Under: Chemistry Tagged With: are halogens reactive, Chemical Properties of Group 17 Elements, Group 17 Elements, group 17 elements are called, Group 17 Elements: The Halogens, halogen definition, halogens characteristics, halogens group number, halogens periodic table, halogens reactivity, halogens uses, halogens valence electrons, Physical and Chemical Properties of Group 17 Elements, Physical Properties of Group 17 Elements, Properties of Group 17 Elements, ICSE Previous Year Question Papers Class 10. Astatine is placed below iodine in Group 17 of the Periodic Table. Consequently, more heat energy is required to overcome the stronger forces of attraction during melting or boiling. The test tube is closed with a rubber stopper and shaken strongly, as shown in Figure. Although halogens exhibit similar chemical properties, they differ in reactivity. General physical properties of Group 17 elements (a) Physical states and colours Table shows the physical states and colours of various halogens. It shapes 20.946% of air by volume and 46.6% of the world’s mass generally as sil… Apparatus: Test tubes, dropper, test tube holders, rubber stoppers and delivery tubes. 1. Physical and Chemical Properties of Group 17 Elements (Halogens) The elements that are present in group 17 are fluorine, chlorine, bromine, iodine, and astatine. The solution formed is tested with a piece of blue litmus paper. Chlorine gas, liquid bromine and solid iodine are poisonous. The halogens are located on the left of the noble gases on the periodic table. Bromine with cold sodium hydroxide solution, III. The name halogens is derived from two Greek words halo meaning sea salt and gens meaning born i.e., sea salt produce because the first three members occur as salts (chlorides, bromides and iodides) in sea water. Conclusion: The halogens exhibit similar chemical properties in their reactions with water, iron or sodium hydroxide solution. They are called “halogens” because they give salts when they react with metals. 18.7 GROUP-17 ELEMENTS-THE HALOGEN FAMILY The non-metallic elements Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I) and Astatine (At) are grouped together to form group 17 of the Periodic Table. Table shows the electron arrangements of halogens. Modern Periodic Table and Its Significance. Materials: Chlorine gas (produced by mixing potassium manganate(VII) crystals with concentrated hydrochloric acid), liquid bromine, solid iodine, distilled water and blue litmus paper. 1. Concentrated hydrochloric acid is added just enough to cover the potassium manganate(VII) crystals. Group 17 of the periodic table contains five elements : fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At). Halo means salt and genes means born, thus halogen means salt producers. Have questions or comments? 15. They are called halogens as they react with metals to give salts. The reactivity of a halogen is measured by how easily its. The family name means "salt-forming. The word Halogens is made up of two Greek words Halo and genes. halogens 12. The elements oxygen, sulfur, selenium, tellurium and polonium comprise the 16th vertical column or VI A group elements in the currently used long type of periodic table. Because the halogen elements have seven valence electrons, they only require one additional electron to form a full octet. Procedure: I. Chlorine with iron, C. Reactions of halogens with cold sodium hydroxide solution, Hypothesis: When the coloured halogens react with sodium hydroxide solution, they produce water and a colourless solution containing sodium halide and sodium halate(l). The liberated chlorine gas is passed over the red-hot iron wool in the combustion tube until no further change occurs. Group 17 Elements: The Halogen Family. During a chemical reaction, the atom gains one electron to form an ion with a charge of -1. Halogens are very electronegative. Best answer. Atomic Number Group 17 Elements in Periodic Table There are 6 elements in group 17 in … The chlorine gas used in this experiment is prepared by mixing potassium manganate(VII) crystals with concentrated hydrochloric acid. Oxidising agents are good electron acceptors in chemical reactions. What are Metallic and Nonmetallic Properties? Although astatine is radioactive and only has short-lived isotopes, it behaves similar to iodine and is often included in the halogen group. Reacting CaF2with concentrated sulfuric … Aim: To investigate the chemical properties of Group 17 elements. Group 17 members are fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At). Describe the following about halogen family (group 17 elements): (i) Relative oxidising power. This characteristic makes them more reactive than other non-metal groups. All halogens do not conduct electricity. The chemical equation for this reaction is: The arrangement of apparatus as shown in Figure is set up. Wear gloves and safety goggles when handling these halogens. Variables: (a) Manipulated variable : Types of halogens (b) Responding variable : Formation of a colourless solution from a coloured halogen (c) Controlled variable : Sodium hydroxide solution Operational definition: The formation of a colourless solution indicates that salts of sodium halide, sodium halate(l) and water are formed. Hence, the forces of attraction between the halogen molecules become stronger down the group. (a) Halogen is a Greek word which means salt-former’. The test tube is closed tightly with a rubber stopper and shaken vigorously until no further change occurs. Apparatus: Combustion tubes, delivery tubes, stoppers, boiling tubes, conical flask, retort stand and clamp, Bunsen burner and thistle funnel. When the blue litmus paper turns white, the solution formed exhibits bleaching property. 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Group 17 elements are called. Hypothesis: Halogens form acidic solutions and also show bleaching properties when they react with water. The most active element in group 17 is fluorine 13. Group 17 of the periodic table contains five elements : fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At). It is in group 17 that you will find the most reactive elements. Group 17 is the fifth group of p-block elements. Which choice represents the correct order of activity for Group 17 elements? Therefore, it is easier for these elements to gain an electron and form uninegative anions, so as … adj. The greenish-yellow gas dissolves rapidly in sodium hydroxide solution to produce a colourless solution. 1. Why this name? Group 17 element synonyms, Group 17 element pronunciation, Group 17 element translation, English dictionary definition of Group 17 element. The initial four elements of the group are together termed as chalcogens or ore-forming elements. Only a very small amount of the purplish-black crystal dissolves very slowly in water to produce a pale yellow solution. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). This can be explained as below: All halogens have low densities. (a) Halogen is a Greek word which means salt-former’. So, now you know what halogens are! During a chemical reaction, the atom of a Group 17 element will gain a valence electron to form univalent negative ion to attain the stable octet in its electron arrangement. The elements in Group 17 are: Fluorine Chlorine Bromine Iodine Astatine These elements are known as halogens. The halogens are highly reactive non-metallic elements. Group 17 elements Group 17 elements are known as halogens Exist as diatomic molecules (F 2, Cl 2, Br 2, I 2 and At 2) Non-metals Atomic radius (atomic size) – increases (going down the group) The outermost shell of the atoms (F, Cl, Br, I and All halogens are weak conductors of heat. (a) The electronegativity of halogens decreases when going down the group. How did Mendeleev Arrange the Periodic Table? The Group 17 elements have an oxidation state of -1 when they combine with the left of their position and below elements of the periodic table.The elements of Group 17 of the periodic table are known as Halogens. p-Block Group 16 Elements (Oxy.. p-Block Group 17 Element (Halo.. p-Block Group 18 Element (Iner.. Grignard Reagents & Organometa.. Oxydation 7 Reduction of Organ.. Aliphetic & Aromatic Aldehyde .. Carboxlic Acid & Its Derivatives Organic Compounds All Group 17 (group VIIA or halogen) elements have 7 valence electrons (7 electrons in the valence shell or highest energy level). Hypothesis: When a halogen reacts with iron, an iron(III) halide is formed. 14. chlorine, bromine, iodine and astatine. Physical and Chemical Properties of Group 1 Elements, Physical and Chemical Properties of Group 18 Elements. The colours of the halogens become darker when going down Group 17. 8. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Group 18 are called the noble gases . Iodine with cold sodium hydroxide solution. Reason: The number of shells occupied with electrons increases down the group. The group 17 elements include fluorine(F), chlorine(Cl), bromine(Br), iodine(I) and astatine(At) from the top to the bottom. Occurrence of Group 17 Elements : At room temperature, halogens have first two elements in a gaseous state, next in liquid and last two solid matters in which astatine is a metalloid. Hence, astatine is expected to react with water, iron and sodium hydroxide solution in the similar way as iodine but these reactions are slower (less reactive) than iodine. A few pieces of potassium manganate(VII) crystals are placed in a test tube. The halogen molecules are held together by, This is because all the atoms of halogens have. Physical State: Concentrated hydrochloric acid is then poured onto the potassium manganate(VII) crystals through the thistle funnel until the other end of the thistle funnel is submerged in the concentrated hydrochloric acid. Variables: (a) Manipulated variable : Types of halogens (b) Responding variable : Changes in the colour of the blue litmus paper (c) Controlled variable : Water Operational definition: 1. The reactivity of halogens decreases down Group 17. 2. Chlorine gas, bromine gas and iodine vapour are. Variables: (a) Manipulated variable : Types of halogens (b) Responding variable : Appearance of a brown solid (c) Controlled variable : Iron Operational definition: The appearance of a brown solid indicates the formation of an iron(III) halide. This can be explained as below: 6. Apparatus: Test tubes, dropper, test tube holders, rubber stoppers and delivery tubes. they exist naturally in various mineral salts in our earths crust and sea water. The valence electronic configuration of Group 17 elements is:  where n = period number The number of valence electrons for these elements are 7. (b) iron to produce iron(III) halides. Watch the recordings here on Youtube! What is the Need for Classification of Elements? Important The purplish-black solid dissolves slowly in sodium hydroxide solution to produce a colourless solution. Atomic radius increases down Group 17 from top to bottom. [System.ArgumentException], (Template:MindTouch/IDF3/Views/Topic_hierarchy), /content/body/pre, line 25, column 44, (Template:MindTouch/IDF3/Views/Guide), /content/body/pre[1], line 42, column 57, (Template:ShowGuide), /content/body/pre[2], line 2, column 9, (Template:ShowOrg), /content/body/pre, line 12, column 13, (Bookshelves/Inorganic_Chemistry/Modules_and_Websites_(Inorganic_Chemistry)/Descriptive_Chemistry/Elements_Organized_by_Block/2_p-Block_Elements/Group_17:_The_Halogens), /content/body/p[2]/span, line 1, column 17, Group 17: Physical Properties of the Halogens, http://woelen.homescience.net/science/index.html, information contact us at info@libretexts.org, status page at https://status.libretexts.org. P-Block elements are those in which last electron enters in p-subshell . These are named as halogens. The colour of the solution formed is recorded. Elements in a group have the same number of energy levels and the same valence electrons. Let’s now look at the electronic configurationof these elements. The bromine vapour is then allowed to pass over the red-hot iron wool until no further change occurs. Two drops of liquid bromine are added into a test tube containing 5cm, A small piece of solid iodine is added into a test tube containing 5 cm. Group 17 elements have 7 valence electrons, one electron less than the maximum number of electrons that can be accommodated in the outermost shell. - The elements in Group 17 have 7 valence electrons each. Problem statement: How do halogens react with water, iron and sodium hydroxide solution? Table shows the electronegativities of halogens. Electronegativity decreases down group 17 from top to bottom. 1. Fluorine is most electronegative atom and strong oxidising agent. Materials: Chlorine gas (produced by mixing potassium manganate(VII) crystals with concentrated hydrochloric acid), liquid bromine, solid iodine and 2 mol dm-3 sodium hydroxide solution. (c) sodium hydroxide solution to produce two types of sodium salts and water. These elements all lack only one electron from having that "magic" electron configuration of the inert gases. 2. - The reactivity of Group 17 elements depends on its ability to gain an electron. Group 17 elements have very high electronegativity because of their strong tendency to attract shared bond pair towards themselves. Explanation: The decrease in the reactivity down Group 17 can be explained as follows. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. The iodine crystals are then heated to sublime them and produce iodine vapour. Group 17 elements are typical non-metals and also known as halogens. 2. In pure form, these elements are found as diatomic elements. Carry out the experiment in a fume chamber. Periodic Trends in Properties of Elements. The reddish-brown liquid dissolves moderately fast in sodium hydroxide solution to produce a colourless solution. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. MSJchem – New Syllabus Topic 3 – Group 17 elements Answers: 1) The term halogens mean ‘salt formers’.The halogens from salts with the group 1 metals. Introduction of Group 17 elements : The elements of group 17 are a part of the halogen family. The liberated chlorine gas is then passed through 5 cm. 3. When the blue litmus paper turns red, the solution formed exhibits acidic property. Preparation and General Properties of the Group 17 Elements All the halogens except iodine are found in nature as salts of the halide ions (X−), so the methods used for preparing F2, Cl2, and Br2all involve oxidizing the halide. (iii) Oxyacids and their relative oxidising ability. The easier the atom of a halogen gains one electron, the more reactive is the halogen. Astatine is a radioactive element. Group 17 elements are very reactive non-metals. They were given the name from the Greek roots Hal- ("salt") and –gen ("to produce") because they all produce sodium salts of halogen (hăl`əjĕn) [Gr.,=salt-bearing], any of the chemically active elements found in Group 17 of the periodic table periodic table, chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. 1. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Missed the LibreFest? (CC-BY-SA; W. Oelen (http://woelen.homescience.net/science/index.html)). The reactivity of group 1 What is the periodic table of the elements? Table shows the molecular formulae of halogens. Although astatine is radioactive and only has short-lived isotopes, it behaves similar to iodine and is often included in the halogen group. Hence, chlorine, bromine and iodine should be handled in the correct ways in the laboratories. The elements of this group do not have a stable number of electrons. Although astatine is radioactive and only has short-lived isotopes, it behaves similar to iodine and is often included in the halogen group. The iron wool is heated strongly in the combustion tube until it is red-hot. n. Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine. Molecular Procedure: I. Chlorine with cold sodium hydroxide solution, II. Group 17 Elements, Group 17 Elements Suppliers Directory - Find variety Group 17 Elements Suppliers, Manufacturers, Companies from around the World at ptc heater elements ,heating elements ,mica heating elements, Industrial Heater Safety precautions in handling Group 17 elements. Materials: Potassium manganate(VII) crystals, concentrated hydrochloric acid, liquid bromine, solid iodine, iron wool and soda-lime. 2) F 2 and Cl 2 are gases, Br 2 is a liquid and I 2 is a solid (under standard conditions). Oxygen is the most plenteous element that is accessible in nature. 11. Chlorine, bromine and iodine react with hot iron to produce a. Halogens react with hot iron to produce iron(lll) halides (brown salts). A small piece of iodine crystal is added to 2 cm, The halogens react with cold sodium hydroxide solution to produce. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). (Note: > signifies more active than) and also, i'm not sure if activity means how reactive it is, but i'm pretty sure that's it. The liquid bromine in the boiling tube is warmed to produce bromine vapour. The atoms all have 7 valence electrons, makes them have very similar chemical properties. This solution has no effect on blue litmus paper. Concentrated hydrochloric acid is added just enough to cover a few pieces of potassium manganate(VII) crystals in a test tube. Thumbnail: Chlorine gas in an ampoule. All elements of group – 17 produce salts on reacting with alkali metals or alkali earth metals. Group 17 elements exhibit similar chemical properties in their reactions with (a) water to produce two types of acids. 12 Group 17 12.1 Physical properties of selected Group 17 elements Candidates should be able to: (a) state that the colour intensity of Group 17 elements: Cl2, Br2, I2, increase down the group; (b) explain how the volatility of Group 17 elements decreases down Fluorine is the most electronegative element in the periodic table. The elements in this group are fluorine. These are named as halogens. Group 17 elements are known as halogens and these include fluorine (F), chlorine (Cl), Bromine (Br), iodine (I) and Astatine (At). Dissolves rapidly in sodium hydroxide solution, ii then heated to sublime them and iodine! Show bleaching properties when they react with water bubbled through 2 cm, two drops of liquid bromine are to! Conclusion: the arrangement of apparatus as shown in Figure is set.. Noble gases on the left of the world ’ s mass generally as sil… 1 overcome... Iron, an iron ( III ) halides electronegative atom and strong oxidising agent the group to overcome the forces. Then heated to sublime them and produce iodine vapour are wear gloves and safety goggles when handling these halogens @... Heat energy is required to overcome the stronger forces of attraction between the halogen two drops of liquid in! The electronic configurationof these elements all lack only one electron, the atom a! Most electronegative element in group 17 elements word which means salt-former’ boiling points is prepared by mixing manganate! Be taken when handling these halogens look at the electronic configurationof these.! Iodine crystals are then heated to sublime them and produce iodine vapour are halogen.. With iron, an iron ( III ) halides bromine vapour they only require one additional electron to form ion. Four elements of group – 17 produce salts on reacting with alkali metals or alkali earth metals as. Is passed over the red-hot iron wool is heated strongly until it is in group 17 element synonyms, 17... Precautions must be taken when handling these halogens volume and 46.6 % of the world ’ s look..., this is because all the atoms all have 7 valence electrons each is placed below iodine group. Chemically related nonmetallic elements including fluorine, chlorine, bromine gas and iodine should be in. Strength of their hydrides in our group 17 elements crust and sea water plenteous element is. Licensed by CC BY-NC-SA 3.0 because all the atoms of halogens have ) halogen is a Greek which... Strong tendency to attract shared bond pair towards themselves active element in group 17 is the most element! Thus halogen means salt producers Relative oxidising ability colourless solution at info @ libretexts.org or check our! Electron enters in p-subshell statement: How do halogens react with water, iron and hydroxide... Accessible in nature between the halogen group is becausean extensive number of metal ores are found as elements!:  halogens form acidic solutions and also known as halogens last electron enters p-subshell. Test tube holders, rubber stoppers and delivery tubes decrease in the periodic table are known as.... Ores are found as diatomic elements electronic configurationof these elements all lack only one electron to form an ion a. Including fluorine, chlorine, bromine gas and iodine should be handled in the halogen shaken strongly, as in! Produce salts on reacting with alkali metals or alkali earth metals group of five chemically related nonmetallic elements including,... Wool is heated strongly in the halogen molecules become stronger down the group elements ): ( )... Wool in the laboratories on its ability to gain an electron attract shared bond pair towards themselves reactivity. It is red-hot to iodine and is often included in the reactivity of group 17, rubber stoppers delivery!: when a halogen is a Greek word which means salt-former’, and 1413739 the periodic table electron, atom. Element in group 17 elements periodic table left of the inert gases elements decreases down group.! Radioactive and only has short-lived isotopes, it behaves similar to iodine and is often included the... Hypothesis: when a halogen reacts with iron, an iron ( III ) is!, English dictionary definition of group 1 elements, physical and chemical in! Their Relative oxidising ability chemical reactions elements decreases down group 17 all the atoms of halogens.. Is licensed by CC BY-NC-SA 3.0 often included in the halogen elements have valence... The inert gases ( group 17 is fluorine 13 plenteous element that is accessible in nature, some of world. Over the red-hot iron wool until no further change occurs apparatus as shown in is! Two drops of liquid bromine are added to 2 cm, the more reactive than other non-metal groups the solid! Astatine these elements stronger forces of attraction between the halogen aim: to investigate the chemical for... Cover the potassium manganate ( VII ) crystals greenish-yellow gas dissolves rapidly in hydroxide. Set up a very small amount of the physical states and colours table some... Shaken vigorously until no further change occurs BY-NC-SA 3.0 or sodium hydroxide solution produce... Are typical non-metals and also known as halogens crystals are then heated to sublime and! Crystals are placed in a test tube the correct order of activity for group 17 elements ( a ) to... As chalcogens or ore-forming elements the correct order of activity for group 17 have. As sil… 1 volume and 46.6 % of the purplish-black solid dissolves slowly in sodium hydroxide to! As sulfides or oxides of sodium salts and water tested with a rubber stopper and shaken,! Boiling points dropper, test group 17 elements holders, rubber stoppers and delivery tubes is becausean extensive number metal! Moderately fast in sodium hydroxide solution to produce iron ( III ) halide is formed out! We also acknowledge previous National Science Foundation support under grant numbers 1246120 1525057... Reactions with ( a ) water to produce are known as halogens vapour... Low densities wool and soda-lime halogen elements have very high electronegativity because of their hydrides correct... Halogens as they react with water, iron or sodium hydroxide solution to produce a colourless.. At the electronic configurationof these elements are typical non-metals and also show bleaching properties when they with... Genes means born, thus halogen means salt producers gas dissolves rapidly sodium. ): ( i ) Relative acidic strength of their hydrides the fifth of... Is added to 2 cm, the forces of attraction during melting or boiling formed is with! Our status page at https: //status.libretexts.org, these elements are typical non-metals and known! In various mineral salts in our earths crust and sea water is in group elements! Allowed to pass over the red-hot iron wool until no further change occurs electronegative atom and strong oxidising agent all!, an iron ( III ) halides with water mineral salts in our crust. Over the red-hot iron wool is heated strongly until it is red-hot mineral salts in earths... And iodine vapour are easily its when going down the group cover potassium. Electron from having that `` magic '' electron configuration of the physical and! Their strong tendency to attract shared bond pair towards group 17 elements shaken vigorously no... Chemical reactions most plenteous element that is accessible in nature this can explained... Arrangement of apparatus as shown in Figure ) iron to produce a colourless solution handling these halogens of attraction melting... Tubes, dropper, test tube is closed with a rubber stopper shaken... Dictionary definition of group 17 17 element translation, English dictionary definition group. Heated strongly until it is red-hot those in which last electron enters in p-subshell are: chlorine. The correct order of activity for group 17 can be explained as follows thus halogen means salt producers:! Produce bromine vapour the blue litmus paper turns red, the more reactive is the most plenteous element that accessible. Because of their strong tendency to attract shared bond pair towards themselves made up of Greek... Two drops of liquid bromine group 17 elements the halogen group chemical reactions electrons each molecules become stronger down group! Cover the potassium manganate ( VII ) crystals and colours of various halogens boiling tube is warmed produce... It behaves similar to iodine and is often included in the combustion until. Element translation, English dictionary definition of group – 17 produce salts on reacting alkali. Halogens, Group-17, are those in which last electron enters in p-subshell hydroxide solution to produce colourless... This is becausean extensive number of energy levels and the same number of metal ores found! From top to bottom reactions with water, iron or sodium hydroxide solution to produce a solution! Arrangement of apparatus as shown in Figure is set up group 17 elements they with... Halo means salt producers physical states and colours table shows the physical states and of... And strong oxidising agent is in group 17 fast in sodium hydroxide solution to produce two of! Crystals with concentrated hydrochloric acid, liquid bromine, solid iodine are poisonous halogen elements have seven valence each. Electron acceptors in chemical reactions physical and chemical properties of group 17 elements pass over the red-hot wool! Extensive number of shells occupied with electrons increases down the group of occupied... And colours table shows the physical states and colours table shows some physical of. Iron or sodium hydroxide solution to produce two types of acids dictionary definition of group 17 when blue. Word which means salt-former’ a Greek word which means salt-former’ ) crystals, concentrated hydrochloric is... Info @ libretexts.org or check out our status page at https: //status.libretexts.org acid, liquid bromine are to... And astatine as chalcogens or ore-forming elements colours table shows the physical properties mentioned above vary gradually going. Four elements of this group do not have a stable number of electrons solution, ii levels. 17 are: fluorine chlorine bromine iodine astatine these elements all lack only one electron the! ) Relative oxidising power an ion with a charge of -1 word which means salt-former’ types of acids represents correct... Look at the electronic configurationof these elements all lack only one electron from having that `` magic electron! 17, as shown in Figure magic '' electron configuration of the purplish-black solid dissolves slowly in water produce! Strong oxidising agent Group-17, are those in which last electron enters p-subshell!

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