Fe Cation Charge

Nickel(IV) Ni4+ lead(IV) Pb4+ Roman numeral notation indicates charge of ion when element commonly forms more than one ion. For example, iron(II) has a 2+ charge; iron(III) a 3+ charge. As there is only one iron ion, its charge must be 2+. It is an iron (II) ion, as opposed to iron (III) ion (which has a charge of 3+). A few elements, all metals, can form more than one possible charge. For example, iron (Fe) atoms can form 2+ cations or 3+ cations. Cobalt (Co) is another element that can form more than one possible charged ion (2+ and 3+), while lead (Pb) can form 2+ or 4+ cations. Cations (multiple oxidation state) Name (Roman numeral gives the positive charge!) Polyatomic Ions To: memorize: Name Fe: 3+ iron(III) NH 4 + ammonium Fe: 2+ iron(II) NO 2-nitrite Cu: 2+ copper(II) NO 3-nitrate Cu+ copper(I) SO 3 2-sulfite Cr: 3+ chromium(III) SO 4: 2-sulfate: Ni2+ nickel(II) OH-hydroxide: Pb4+ lead(IV) PO 4 3-phosphate Pb.

What is the charge on the iron cations in iron(II) chloride and iron (III) chloride, respectively?

1 Answer

The Roman numerals after the name of the iron cation indicates the charge on the iron cation.

Explanation:

When naming ionic compounds which contain metal ions capable of forming more than one kind of cation, the Roman numeral after the metal's name indicates the charge.

Periodic Table With Ion Charges

Therefore, the iron cation in iron(II) chloride has a charge of #2^+#, and the charge on the iron cation in iron(III) chloride has a charge of #3^+'#.

This video provides some additional examples of how to use Roman numerals when naming compounds.

In the image below, a solution of iron(III) chloride is on the left side and a solution of iron(II) chloride is on the right side.

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