Elements `A` and `B` have atomic numbers `11`and `24` respectively. Write their electronic configuration and predict (a) group, (b) period, ( c) block to which they belong? Which of them is representative element?

Explanation

`A(11)1s^(2)2s^(2)2p^(6)3s^(1)`,`B(24)1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(1)3d^(5)`
A belongs to group 1, third period and s-block. It is representative element B and belongs to group 6, fourth period and d-block. It is a transition metal.