Question

What would be the formula between Iron III and Sulfur?

Answer 1

`Fe_2S_3`.

Explanation:

Iron III I has a valency of `3+` and sulphur, being in group 6< has a valency of `2-`.

A molecule must have a net charge of zero and so we would need 3 sulphur atoms and 2 iron atoms in order to form a neutral molecule of Iron(III)sulphide. (`6+ and 6-`).

Hence the formula is `Fe_2S_3`.