Ionic Compounds

• composed of cations + anions• electrically neutral

• the total positive charge equals the total negative charge

• formula units• usua lly solid at room temperature• have high melting points

Simple Ionic Compounds

• Metal ion + Nonmetal ion salt• Examples

Be+2 + N -3 Be3N2

Fe+3 + Cl -1 FeCl3

Subscript shows number of atoms present in formula unit

Polyatomic Ions

Collections of tightly bound atoms that behave as a unit and carry a charge

examplesSO3

-2 sulfite ion SO4-2 sulfate ion

NO2 -2 nitrite ion NO3

-1 nitrate ion

ClO2-1 chlorite ion ClO3

-1 chlorate ion

Ionic Compounds with Polyatomic Ions

• Metal ion + Polyatomic ion or• Polyatomic ion + nonmetal ion• examples

– Na+1 + SO4-2 Na2SO4

– Mg+2 + NO3-1 Mg(NO3)2

– NH4 +1 + N -3 (NH4)3 N

Oh no parentheses!

Given a formula, what’s the compound’s name?

e.g. Be2C

NH4MnO4

Al2(C2O4)3

H2SO4

Given a compound’s name, what is its formula?

e.g. ammonium sulfitephosphoric acidcalcium chlorideiron (III) nitrite

Practice, practice, practice

name formulaformula name

Simple Molecular Compounds

• Composed of two non-metallic compounds

• Uses prefixes to indicate the number of atoms in the molecule

• mono, 1• di, 2• tri, 3• tetra, 4• penta, 5• hexa, 6• hepta, 7• octa, 8• nona, 9• deca 10

Simple Molecular Compounds

examples: formula nameCO carbon monoxideCO2 carbon dioxide

N2O dinitrogen monoxide

Cl2O3 dichloro trioxide

SF6 sulfur hexafluoride

More Simple Molecular Compounds

examples: name formula

nitrogen trifluoride NF3

phosphorus trichloride PCl3carbon tetrachloride CCl4