What is the numerical value of the charge indicated by when naming a transition metal ion that can have more than one common ionic charge?

Answer 1

When naming a transition metal ion that can have more than one common ionic charge, the numerical value of charge is indicated by either (i) the charge number in capital Roman numerals within parentheses after the cation name or (ii) a distinct form of the cation name, ending in "ic" for the higher ionic charge or "ous" for the lower ionic charge. Method (i) is usually preferred now, but method (ii) was often used fifty years ago and is sometimes still used.

Answer 2

Compounds of elements which have multiple ions (or oxidation numbers) are named by putting the charge( oxidation number) in roman numerals after the element name. For example

FeSO4, iron (II) sulfate

FeCl3, iron(III) chloride

Fe3O4 iron (II, III) oxide

It applies to all elements and is most often used with the transition metals where multiple ions are common. A non-transition metal example is gallium dichloride (formula Ga+ GaCl4- ) and is written as gallium (I, III) chloride

Answer 3

Example: iron

The cation Fe2+: Fe(II), iron(2+), ferrous iron ion

The cation Fe2+: Fe(III), iron(3+), ferric iron ion

Ferrous and ferric (and similar names for other cations) are not recommended by IUPAC.

Answer 4

To name a transition metal with more than one common ionic charge, you put a Roman numeral after the name. For example, copper can be named as Cu2.

Answer 5

Transition metals form ions with more than one charge because they can have more than one positive oxidation state. It refers to the number electrons lost or gained in a chemical reaction.