Question

What is the number of valence electrons in magnesium?

Answer 1

Magnesium has 2 valance electrons.

Explanation:

The electron configuration of Magnesium is `1s^2 2s^2p^6 3s^2`

The `1s^2 2s^2 2p^6` is the electron configuration of Neon `Ne_10`

This first 10 electrons are in a stable configuration leaving only 2 valance electrons. the `3s^2` electrons.

So the charge on Magnesium as an ion is usually +2 wen it loses the two `3s^2` electrons.