<unk>  forms a variety of compounds with oxygen and a number of these fit the description of an<unk>  A<unk> contains<unk>  and oxygen, at least one hydrogen atom bound to oxygen, and forms an ion by the loss of one or more protons.
Phosphorus oxoacids
Chromate
Phosphorous acid
Hypophosphorous acid
Organophosphorus
Phosphonic acid
Fluoride
Messianic complex