Question

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

Answer 1

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

Answer 2

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.