What is the atomic number of the element with `M^(2+)` ion having electronic configuration `[Ar] 3d^(8)` ?

Options

A. 28
B. 26
C. 25
D. 27

Answer

A

Explanation

`[Ar] 3d^(8)` is `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(8)`
`:.` no. of electrons in `M^(2+) = 26`
`:.` Atomic number of `M = 26+2 =28`