Question

What is the possible compound among the following?

• A. $A{l}_2{O}_3$
• B. $A{l}_2{O}_2$
• C. $A{l}_2{O}_5$
• D. $Al{O}_3$

Answer 1

Answer: (A)

$A{l}_2{O}_3$

Aluminum ion has an charge of $+3$ and oxygen has $-2.$
Now 3 oxygen ions have an total of 6 excess electrons and give it 2 aluminum ions which has a deficiency of 6 electrons to form a ionic bond.
$3O^{2-}$ and $2A{l}^{+3}$ combine to give $A{l}_2{O}_3$