Question

When writing a formula for a compound having a transition metal in it, _____.

it is sometimes necessary to use the Roman numeral as the assigned charge of the metal
it is sometimes necessary to include a Roman numeral after the symbol of the metal
it is always necessary to include a Roman numeral after the symbol of the metal
it is always necessary to use the Roman numeral as the assigned charge of the metal

-please explain

Answer 1

it is always necessary to use the roman numeral as the assigned charge of the metal.

Step-by-step explanation:

This is so that one would know which Transition metal is being used. For example copper (II) would be Cu²+