And #"sodium chlorate(V)"# is the old sodium chlorate, #NaClO_3#.
#ClO_4^-#; i.e. #Cl(+VII)#, #"perchlorate."#
#ClO_3^-#; i.e. #Cl(+V)#, #"chlorate."#
#ClO_2^-#; i.e. #Cl(+III)#, #"chlorite."#
#ClO^-#; i.e. #Cl(+I)#, #"hypochlorite."#
#Cl^-#; i.e. #Cl(-I)#, #"chloride."#
And these are the salts of the chlorine oxyacids.......#"perchloric acid"#, #HClO_4#, .......#"chloric acid"#, #HClO_3#, #HO_2Cl#, #"chlorous acid"#, #HOCl#, #"hypochlorous acid"#. Confused yet? You do not have to know these names at A level, or even as a first year undergrad. You should know how the oxidation noombers are assigned. Do you?