NOMENCLATURE

Naming compounds

POLYATOMIC IONS

Ions made up of multiple types of elements
Collectively act as one charge

NH4+ ammonium	NO2- nitrite	NO3- nitrate	SO32- sulfite	SO42- sulfate
HSO4- hydrogen sulfate	S2O32- thiosulfate	OH- hydroxide	CN- cyanide	SCN- thiocyanate
PO43- phosphate	HPO42- hydrogen phosphate	H2PO4- dihydrogen phosphate	CO32- carbonate	HCO3- hydrogen carbonate
ClO- hypochlorite	ClO2- chlorite	ClO3- chlorate	ClO4- perchlorate	C2H3O2 acetate
MnO4 permanganate	CrO42- chromate	Cr2O72- dichromate	O22- peroxide	C2O42- oxalate

ite removes 1 O from the ion, charge remains the same
H changes charge, not number of O
Per- (hyper, more than) 1 more O
Hypo- (lower than) 1 less O
Thio- add 1 S, remove 1 O
O2- is oxide, O22- is peroxide
Phosphorus (P) is not phosphite (PO43+)
- Watch for with other polyatomics vs. element (corresponding root)

IONIC COMPOUNDS (SALTS)

Created when metals bond with nonmetals/metalloids (left-right bonding)
- Metals do not bond with other metals (form alloys)
When metals bond to nonmetals/metalloids, they do so as IONS
- Metals - cations, nonmetals - anions
- Net charge of a salt must be neutral
Always solid at room temperature

COMPOUNDS FROM NAMES

Determine ions and their charges (can be polyatomic ions) - Na+, O2-
Write compound with cation first, anion second - Na+O2-