To name a variable charge monatomic cation:

-list the element name followed by a Roman numeral to represent the ion charge

-drop the ending of the element name and replace it with the suffix "-ide"

-list the element name followed by the word "ion"

-add the prefix "hyper" and the suffix "-ate" to the element name

The correct answer is "list the element name followed by a Roman numeral to represent the ion charge"

Explanation:

For polyvalent metals, the ion charge must be specified. The name of the element as ion will not give sufficient information to specify the type of cation. Most transition metals, block d of the periodic table, are polyvalent. They can form cations with different loads.

In ionic compounds, the charge magnitude of a transition metal cation is generally included with Roman numerals in parentheses after the metal name.

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