[cuongt]

im just wondering if phosphine is polar or nonpolar?? and can some one give me a reason to why it is non polar or polar. thanxxx

[Albert]

I think it's polar: although it's more soluble in non-polar solvents than water, its dipole moment is not zero and it has trigonal bipyramidal structure.

[enahs]

Also, If you write out the Lewis Diagram for Phosphine, the phosphorus has a single lone pair of electrons on it, which is clear indication of polarity.