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It is the oxidation state of the element, usually positive and used with metals. It can also be used without brackets and in superscript.

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Q: What does roman numeral in parenthesis after the name of the element?
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Why is roman numeral placed after the name of most transition element ions?

to present the oxidation numbers of transition elements according to IUPAC System.


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What does a Roman numerals represent in a chemistry?

A Roman numeral in parentheses, followed by the name of the element, is used for elements that can form more than one positive ion. This is usually seen with metals. Although Roman numerals are used to denote the ionic charge of cations, it is still common to see and use the endings -ous or -ic. These endings are added to the Latin name of the element.


What does a roman numeral after a transition metal in a chemical name mean?

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The oxidation state of a metal is indicated in the name of a compound if and when that metal has more than one oxidation states. The oxidation state is then indicated by a Roman numeral placed in parenthesis next to the metal (Stock System).


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Is there a comma after the name and before the roman numeral in Mark Smith Jones IV?

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