Chlorine can exhibit variable oxidation states of -1, 0, 1, 3, 5 & 7.
Chloride oxidation state -1 e.g. NaCl
Chlorine oxidation state 0 e.g. Cl2
Chlorate(I) oxidation state +1 e.g. NaClO - also called sodium hypochlorite
Chlorate(III) oxidation state +3 e.g. NaClO2 - also called sodium chlorite
Chlorate(V) oxidation state +5 e.g. NaClO3 - also called sodium chlorate
Chlorate(VII) oxidation state +7 e.g. NaClO4 - also called sodium perchlorate