Ternary Ionic Compoundspolyatomic ions- ions made up of two or more

atoms that carry a charge

*found on sheet

ex- sulfate SO4 2-

hydroxide OH 1-

nitrite NO2 1-

-most polyatomic ions are anions

-only positive on sheet is:

ammonium NH41+

Ternary Ionic Compounds

-compounds that contain ions of usually three different elements with a polyatomic ion

Rules for naming ternary ionic compounds

1)write the formula (symbol and charge) for each ion

ex- calcium + nitrate

Ca2+ NO31-

2)criss cross charges

Ca1NO32

3) you may need parentheses around polyatomic ion if a subscript greater than 1 goes there

Ca1(NO3)2

4) lowest whole number ratios

Ca(NO3)2

5) name cation then polyatomic anion

calcium nitrate

Examples:

1)potassium + sulfate

K1+ SO42-

K2SO4

potassium sulfate

2) tin (IV) + sulfite

Sn4+ SO32-

Sn2(SO3)4

Sn(SO3)2

tin (IV) sulfite