Question

The atomic number of an element $M$ is $26$. How many electrons are present in the $M$-shell of the element in its state

• A. $14$
• B. $13$
• C. $11$
• D. $15$

Answer 1

Answer: (B)

It is an example of Fe atom
$Fe\to K\to 1s^2$
$L\to 2s^{2}2p^6$
$M\to 3s^{2}3p^{6}3d^6$
$N\to 4s^2$
$F{e}^{3+}\to K\to 1s^2$
$L\to 2s^{2}2p^6$
$M\to 3s^{2}3p^{6}3d^5$
Total number of electrons in M shell is $13$