Elements for which there are no data will always give a value of zero for the weight, no matter what you put in the weight box. Here are a few notes about the hazards and risks associated with phosphorus. Elemental phosphorus is severely toxic, the white form more so than the red form. Phosphate esters are nerve poisons and should only be handled by a competent chemist. Inorganic phosphate are relatively harmless.
Phosphate pollution occurs as a result of leached fertilisers and from many detergents.