Question

In the ground state, an element has 13 electrons in its M-shell. The element is:

• A. manganese
• B. cobalt
• C. nickel
• D. iron

Answer 1

The correct option is A manganese

In $Mn$, M shell = 3rd shell has 13 electrons.

$3s^{2}3p{P}^{6}3d^5$,

Hence total $13$ electrons are in the M shell of manganese.

Hence, the correct option is $\text{A}$