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Monatomic and polyatomic ions, specifically for students of CHEM 127 at Cal Poly SLO, but useful for anyone. Note that only a subset of possible monatomic ions are included (there are numerous monatomic cations). Also, these flashcards don't have subscripts/superscripts which are, of course, required in real usage.

fluoride ion



chloride ion

bromide ion



iodide ion

oxide ion

O2 2-

S 2-

sulfide ion

selenide ion

Se 2-

Te 2-

telluride ion

lithium ion



sodium ion

magnesium ion

Mg 2+

Zn 2+

zinc ion

cadmium ion

Cd 2+

Ca 2+

calcium ion

barium ion

Ba 2+

V 3+

vanadium (III) ion

silver ion

Ag +

Sn 4+

tin (IV) ion

scandium (I) ion

Sc +

Hg2 2+

mercury (I) ion

mercury (II) ion

Hg 2+

NH4 +

ammonium ion

acetate ion

C2H3O2 -


hydroxide ion

hypochlorite ion

ClO -

ClO2 -

chlorite ion

chlorate ion

ClO3 -

ClO4 -

perchlorate ion

nitrite ion

NO2 -

NO3 -

nitrate ion

permanganate ion

MnO4 -


cyanide ion

silicate ion

SiO3 2-

S2O3 2-

thiosulfate ion

hydride ion


CO3 2-

carbonate ion

hydrogencarbonate ion

HCO3 -

CrO4 2-

chromate ion

dichromate ion

Cr2O7 2-

PO4 3-

phosphate ion

hydrogenphosphate ion

HPO4 2-

H2PO4 -

dihydrogenphosphate ion

phosphite ion

PO3 3-

SO4 2-

sulfate ion

sulfite ion

SO3 2-

HSO4 -

hydrogensulfate ion

cyanate ion



thiocyanate ion

oxalate ion

C2O4 2-

AsO4 3-

arsenate ion

peroxide ion

O2 2-

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