# What is the ionic compound formed between oxygen and aluminum?

Sep 29, 2016

You speak of $\text{alumina, } A {l}_{2} {O}_{3}$.

#### Explanation:

Aluminum generally forms $A {l}^{3 +}$ ions.

Oxygen generally forms ${O}^{2 -}$ ions.

So when the metal and the non-metal make music together they form a neutral compound, i.e. $A {l}_{2} {O}_{3}$ (i.e. 2xx3-3xx2=0).

The ionic bonding is so strong (due to charge magnitude) in this material that it is reasonably insoluble.