Question #024dd

May 12, 2017

$\text{Magnesium oxide} \equiv M g O$........

Explanation:

As the oxide, ${O}^{2 -}$, oxygen has a oxidation state of $- I I$; magnesium ion, as $M {g}^{2 +}$ has an oxidation state of $I I +$. (The oxidation states of the free elements are $0$.)

And thus magnesium ions and oxide ions form a $\text{neutral salt}$ whose formula is $M g O$, i.e. $M {g}^{2 +} {O}^{2 -}$

Here is a short video of a demonstration of the reaction of magnesium and oxygen which forms MgO.

........What about aluminum oxide, where the metal forms an $A {l}^{3 +}$ ion?