What is the ratio of Fe3 + ions to O2 - ions in a neutral compound?

1:2

2:1

2:3

3:2,

The answer is 2:3. Because the lowest common denominator of 2 and 3 is 6, we find that for every 2 Fe3 + ions, we would need 3 O2 - ions to neutralize the charge. The other answers do not fit this idea, as the math doesn't then add up to come to a neutral charge.