polyatomic
ammonium
NH (+ charge, 4 atoms)
nitrite
NO (- charge, 2 atoms)
nitrate
NO (- charge, 3 atoms)
sulfite
SO (2- charge, 3 atoms)
bisulfate/hydrogen sulfate
HSO (- charge, 4 atoms)
sulfate
SO (2- charge, 4 atoms)
hydroxide
OH (- charge)
cyanide
CN (- charge)
phosphate
PO (3- charge, 4 atoms)
hydrogen phosphate
HPO (2- charge, 4 atoms)
dihydrogen phosphate
HPO (- charge, 2 hydrogen atoms, 4 PO atoms)
carbonate
CO (2- charge, 3 atoms)
bicarbonate/hydrogen carbonate
HCO (- charge, 3 atoms)
hypochlorite
C1O (- charge)
chlorite
C1O (- charge, 2 atoms)
chlorate
C1O (- charge, 3 atoms)
perchlorate
C1O (- charge, 4 atoms)
permanganate
MNO (4 atoms)
peroxide
O (2- charge, 2 atoms)
chromate
CrO (2- charge, 4 atoms)
dichromate
CrO (2- charge, 2 Cr atoms, 7 O atoms)