# What is the formula for iron(II) oxide?

Jul 6, 2018

FeO

#### Explanation:

Iron II has a positive 2 charge.
s has a negative 2 charge
They combine in 1:1 ratio
The formula is therefore Fe O

Jul 6, 2018

The formula for iron(II) oxide is $\text{FeO}$.
The formula for the iron(II) ion is $\text{Fe"^(2+)}$ and the formula for the oxide ion is $\text{O"^(2-)}$. An ionic compound is neutral, so the positive and negative charges are equal. In the case of iron(II) oxide, one $\text{Fe"^(2+)}$ ion combined with one $\text{O"^(2-)}$ ion creates a neutral compound. ${2}^{+} + {2}^{-} = 0$