Question

Type in the correct values to correctly represent the valence electron configuration of magnesium: AsB A = B =

Answer 1

Answer : The correct answer will be A =3 and B =2 as the electron configuration of Mg will be as $[Ne] 3s^{2}$ where A is 3 and B is 2.

Explanation :

Magnesium has atomic number as 12. The complete electron configuration will be as $1s^{2}2s^{2}2p^{6}3s^{2}$.

which can be abbreviated as$[Ne] 3s^{2}$ as the electron configuration resembles to that of neon element.

In the outermost shell the electron in 3 s orbital is only 2. So, therefore 3 is the orbital of S and there are 2 electrons in it.

Answer 2

The correct answer would be,
A= 3 
B=2