ionic bonding (2)

-occurs between nonmetal and metal

-electrons are transferred from the metal to the nonmetal forming full outer shells

binary compounds (3)

-contain only 2 elements e.g calcium chloride (CaCl₂)

-put the metal first, change the ending of the second element to -ide

-Ionic lattice must be neutral so charges must be equal

polyatomic ions (3)

-contain more than one atom

NO₃ ^- - nitrate, SO₄ ^2- - sulphate, CO₃ ^2- - carbonate, OH^- - hydroxide, NH₄ ^- - ammonium

ions from the halogens are called halide ions