# If an element has an atomic number of 12, how many electrons are in its its outermost shell?

Jul 25, 2017

2 Electrons

#### Explanation:

Shells $\to$ K L M N O....

K can only contain $2$
while L, M N can only contain $8 , 18$, and $32$, respectively.

The atomic number of 12 is Magnesium has the following number of electrons in their respective shell $2 , 8 , \textcolor{red}{2}$..

Where 2 is the electron in the outermost shell..