(To the Tune of My Darling Clementine)
First there's chromate, then dichromate,
Yes it's true,
When you're charging polyatomics these are always minus 2.
Nitrate, acetate, and permanganate,
Then Hydroxide, so much fun,
When you're charging polyatomics
They are always minus one!
Old ammonium, he's so positive,
Yes he is the only one...
Then there's phosphate, minus 3,
Now your polyatomic song is done!