Chemistry · May / June 2023 · Paper 12 · Question 26

Which statement is correct?

1. AGroup I elements are less reactive than the Group II element in the same period because they only need to lose one electron to have complete shells.
2. BGroup I elements are stored under oil to avoid reaction with oxygen and water in the air.
3. CGroup I elements become more reactive as the group is descended because the number of outer shell electrons increases.
4. DThe melting point of Group I elements decreases as the group is descended because there is more attraction between positive ions and the ‘sea’ of delocalised electrons.

As printed in the paper