1
ionic bonding (2)
-occurs between nonmetal and metal
-electrons are transferred from the metal to the nonmetal forming full outer shells
2
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
3
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