Question

How many electrons are present in the M shell of the atom of an element with atomic number 24?

• A. 5
• B. 6
• C. 12
• D. 13

Answer 1

The correct option is D 13

Electronic configuration of $Cr$ (atomic number 24) $=\left[Ne\right]3s^{2}3p^{6}3d^{5}4s^1$

Therefore number of electrons in M shell (third shell) $=2+6+5=13.$