Question

What is the rule for accounting for transition metals in naming ionic compounds?

• A. Add a Roman numeral in parenthesis after the cation to denote the charge on the cation.
• B. Add a Roman numeral in parenthesis after the anion to denote the charge on the cation.
• C. Add a Roman numeral in parenthesis before the cation to denote the charge on the cation.
• D. Add the prefix mono- or di- or tri- to the cation depending on the charge.
• E. Add the suffix -ate or -ite depending on the charge.

Answer 1

Answer: (A)

Add a Roman numeral in parenthesis after the cation to denote the charge on the cation.

Naming of ionic compound: Add a Roman numeral in parenthesis after the cation to denote the charge on the cation.

Example:
$Fe(OH{)}_3$ has the correct name " Iron(III) hydroxide".
As Iron is the name of "Fe" element and being negative part $OH$ is written as "Hydroxide" and as the charge of $Fe$ is $+3$ hence in the bracket, III is written in roman.