Which one of the statements is correct?
- 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.
- BGroup I elements are stored under oil to avoid reaction with oxygen and water in the air.
- CGroup I elements become more reactive as the group is descended because the number of outer shell electrons increases.
- 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.