Explain the trend in reactivity of the elements in Group 7.
The Halogens decrease in reactivity as you descend through the group. The atoms increase in size and Mr as you go down the group. Therefore their outer electrons are further away from the positive charge of the nucleus. There is a weakened electrostatic force of attraction between the nucleus and the outer electron shell and so it is harder for the atom to complete the outer shell with a new electron.
KS
Related Chemistry GCSE answers
All answers ▸What is the % yield if 12g of magnesium is dissolved in hydrochloric acid to produce 20g of magnesium chloride?
Why are elements of group 0 chemically inert?
Using the % yield calculation (please state), what is the percentage yield for the reaction of calcium oxide with water to produce calcium hydroxide if the theoretical yield is 4.0g but only 1.5g is produced?
A colourless liquid is tested with silver nitrate solution and produces a white precipitate and produces a brick red flame test result. Name the compound found in the colourless liquid