Question

what is the name of the compound whose formula is fes?
a) iron(ll) sulfide
b) iron(iii) sulfide
c) iron(i) sulfide
d) iron sulfide

Explanation:

Step1: Determine the charge of iron

In \(FeS\), sulfur (\(S\)) has a charge of \(- 2\). Let the charge of iron (\(Fe\)) be \(x\). Using the rule that in a neutral compound the sum of charges is zero (\(x+(-2)=0\)), we find \(x = + 2\).

Step2: Name the compound

For ionic compounds with transition metals (like \(Fe\)), we use Roman numerals to denote the metal's charge. Since \(Fe\) has a charge of \(+2\), the name is iron(II) sulfide.

Answer:

A. iron(II) sulfide