Oxidation Number Definition

Chemistry Glossary Definition of Oxidation Number

The transition metals have multiple oxidation numbers.
The transition metals have multiple oxidation numbers, which are why they form so many colors of solutions. Ben Mills
Oxidation Number Definition:

The oxidation number is represented by a Roman numeral. The plus sign is omitted for positive oxidation numbers. The oxidation number is seen as a superscript to the right of an element symbol (e.g., FeIII) or in parentheses after the element name [e.g., Fe(III)] usually with no space between the element name and the parentheses.