Question

What atoms are indicated by the following eletronic configurations ?
(i) `1s^(2) 2s^(2) 2p^(1)` (ii) `[Ar] 4s^(2) 3d^(1)`

Answer 1

(i) Total number of electrons in `1s^(2) 2s^(2) 2p^(1) =2+2+1=5 :.` Atomic number of the element `=5` Hence, the element is Boron (B)
(ii) Total number of electrons in `[Ar] 4s^(2) 3d^(1)=18+2+1=21 :.` Atomic number of the element `=21` Hence, the element is Scandium (Sc)