# Why is the bonding in magnesium oxide similar to the bonding in barium chloride, in terms of valence electrons?

May 28, 2018

Well, both magnesium and barium are $\text{alkaline earths....}$

#### Explanation:

Well, both magnesium and barium are $\text{alkaline earths....}$, the which give dications upon oxidation....

...from Group 2 of the Periodic Table. And given Group 2, there are TWO valence electrons, which are readily oxidized to give dications…

And so $M g \left(s\right) + \frac{1}{2} {O}_{2} \left(g\right) \rightarrow {\underbrace{M g O}}_{M {g}^{2 +} + {O}^{2 -}}$

And likewise...

$B a \left(s\right) + C {l}_{2} \left(g\right) \rightarrow {\underbrace{B a C {l}_{2}}}_{B {a}^{2 +} + 2 \times C {l}^{-}}$