Following are the valence sheel electronic configurations of some elements.
Find out the blocks to which they belong in the periodic table?

Options

A. `3s^(2) 3p^(5)`
B. `3d^(10) 4s^(2)`
C. `2s^(2)3p^(6) 4s^(1)`
D. `1s^(2) 2s^(2)`

Answer

B, C, D

Explanation

The block of the elements depend on the type of sub-shell which receive the last electron. In case of (i) it enters in `3p`-subsheel, (ii) it enters `3d`-subshell, (iii) it enters `4s`-subshell and (iv) it enters `2s`-subshell.