<unk>  compounds are chemical compounds containing carbon-phosphorus bonds.<unk>  chemistry is the corresponding science exploring the properties and reactivity of<unk>  compounds. Phosphorus shares group 15 in the periodic table with nitrogen and phosphorus compounds and nitrogen compounds have much in common.
Phosphorus can adopt oxidation states −3, −1, 1, 3 and 5. In chemical literature very often compounds with +3 or −3 oxidation state are grouped together as having a (III) oxidation state regardless of sign. In an official and more descriptive nomenclature phosphorus compounds are identified by their coordination number δ and their valency λ. In this system a phosphine is a δ3λ3 compound.
Organophosphorus
Organotin
Thiol
Chromate
Cobalt
Organonickel
Organophosphate
Phorate