Hybridization of PH3 (Phosphine)

When we talk about the hybridization of PH3 the answer might be quite surprising. It’s because PH3 does have a well-defined hybridization or the process of hybridization does not occur in the phosphine molecule. We will discuss why this happens below.

Name of the Molecule Phosphine
Molecular Formula PH3
Hybridization Type Nil
Bond Angle 93o
Geometry Trigonal Pyramidal

What is the Hybridization of Phosphine?

If we look at the chemical compound phosphine, during its formation the pure p orbitals take part in bonding and avoid getting hybridized. The lone pair orbital is mainly the s orbital. Phosphorus forms three bond pairs and one lone pair. However, the whole concept can be better explained if you understand Drago’s Rule. This rule states that hybridization will not take place if;

  • Central atom belongs to third or higher period.
  • Central atom has one lone pair.
  • The electronegativity of the terminal atom is less than carbon.

Hybridization Of PH3

In essence, ph3 is a Drago molecule and if we look at its bond angle data it shows that the p-orbitals have an angle of 90°. Looking at its Lewis structure we can state that molecular geometry of PH3 is trigonal pyramidal.

Important Points To Remember

  • In PH3 hybridization does not take place.
  • The pure p orbitals take part in bonding.
  • In phosphine, orthogonal 3p orbitals overlap with 1s orbital of H.

Read More About Hybridization of Other Chemical Compounds