Gap-fill worksheet question "The GROUP 7 HALOGENS"

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   2      7      acidic      atomic      brittle      bromide      bromine      chloride      chlorine      coloured      colourless      covalent      fluorine      gases      green      halide      higher      iodine      ionic      less      metals      molecules      more      non-metals      poor      potassium      purple      red      sodium      solid   
(1)(a) The Group elements are and called the Halogens.
(b) The first two and chlorine, are and the third, , is a liquid and the 4th, iodine, is a .
(c) Chlorine is a gas, bromine a dark liquid and a dark grey solid.
(d) When heated iodine forms a vapour so the colour gets darker down the group
(e) They are and crumbly when solid and are conductors of heat and electricity even when solid or liquid.

(2)(a) These elements have vapours and consist of which are made up of atoms.
(b) They form compounds when combined with in which the chloride, bromide or iodide ion ( ions) carries a charge of -1. These compounds look when solid or in solution.
(c) They form molecular compounds with other non-metallic elements. The compounds with hydrogen are very with a pH of 1.

(3)(a) In Group 7, the further down the group the element is, with increase in number, the reactive the element and the its melting point and boiling point.
(b) A reactive halogen can displace a reactive halogen from an aqueous solution of its salt.
(c) So can displace bromine from a solution of .
(d) Common salt is chemically called and is a very useful raw material.