Central atom:Ppo4 structure
P contributes:5 e
4 x O contibute:8 e
3 x -ve charge:3 e
Total VSE:16
Total VSEP:8
4 x double bonds− 4 pairs
Revised Total:4


  • O=P=O bond angle = 109°
  • The phosphate ion is of vital importance in biological systems. DNA is a phosphate ester as are ATP and ADP (chemicals used to store and release energy in biological systems). The phosphate ion also makes up about two-thirds by mass of our teeth and bones.


3-D rotatable diagram