Question

The atomic number (Z) of an element is 25. In its ground state, how many electrons are present in the N shell:

• A. 13
• B. 2
• C. 15
• D. 3

Answer 1

The correct option is B 2

The electronic configuration is $2,8,13,2$. Thus, K, L, M and N shells will have $2,8,13,2$ electrons respectively.

The element is manganese, a transition metal whose electronic configuration can also be represented as $\left[Ar\right]3d^{5}4s^2$.

2 electrons are present in the N shell of the atom of an element with atomic number 25.

So, the correct option is $B$