Editing Phosphorus (section)

====Oxoacids====
{{main|Phosphorus oxoacids}}
Phosphorus [[oxoacid]]s are extensive, often commercially important, and sometimes structurally complicated. They all have acidic protons bound to oxygen atoms, some have nonacidic protons that are bonded directly to phosphorus and some contain phosphorus–phosphorus bonds.{{r|Greenwood1997}} Although many oxoacids of phosphorus are formed, only nine are commercially important. Among them, hypophosphorous, phosphorous and orthophosphoric acid are particularly important.

{|class="wikitable"
|-
!Oxidation state!!Formula!!Name!!Acidic protons!!Compounds
|-
| +1||{{chem2|HH2PO2}}||[[hypophosphorous acid]]||1||acid, salts
|-
| +3||{{chem2|H3PO3}}||[[phosphorous acid]]<br />(phosphonic acid)||2||acid, salts
|-
| +3||{{chem2|HPO2}}||metaphosphorous acid||1||salts
|-
| +4||{{chem2|H4P2O6}}||[[hypophosphoric acid]]||4||acid, salts
|-
| +5||{{chem2|(HPO3)_{''n''}|}}||[[metaphosphoric acid]]s||''n''||salts (''n''&nbsp;=&nbsp;3,4,6)
|-
| +5||{{chem2|H(HPO3)_{''n''}OH}}||[[polyphosphoric acid]]s||''n''+2||acids, salts (''n''&nbsp;=&thinsp;1-6)
|-
| +5||{{chem2|H5P3O10}}||[[tripolyphosphoric acid]]||3||salts
|-
| +5||{{chem2|H4P2O7}}||[[pyrophosphoric acid]]||4||acid, salts
|-
| +5||{{chem2|H3PO4}}||(ortho)[[phosphoric acid]]||3||acid, salts
|}