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 ▸Calculate the atom economy for making hydrogen when zinc is reacted with HCL?
Give an example of an alkane and give one main difference between alkane and alkene?
A student wanted to make 10.0 g of zinc chloride. The equation for the reaction is: ZnO(aq) + 2HCl(aq) → ZnCl2(aq) + H2O(l) Calculate the mass of zinc oxide the student needs to react with the dilute acid to make 10.0 g of zinc chloride. [4 marks]
How is crude oil separated into fractions?