Is GaH3 polar or nonpolar? – Polarity of GaH3

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The question is –

Is GaH3 polar or non-polar?


GaH3 is a non-polar molecule.


Gallium trihydride (GaH3) is a symmetrical trigonal planar molecule.

The dipole moments of three individually polar Ga-H bonds get canceled uniformly to yield an overall non-polar molecule (net µ = 0).

GaH3 is composed of three Ga-H bonds, one on each of the molecules.

Each Ga-H bond is weakly polar as a specific electronegativity difference of 0.39 units exists between the single-covalently bonded gallium (E.N = 1.81) and hydrogen (E.N = 2.20) atoms. 

Thus, each Ga-H bond possess a specific dipole moment value (symbol µ).

The central Ga-atom gains a partial positive (δ+) charge, while each terminal H-atom gains a partial negative charge (δ-) in GaH3.  

However, there is no lone pair of electrons on the central Ga-atom, so the GaH3 molecule occupies a symmetrical trigonal planar shape and molecular geometry.

is gah3 polar or nonpolar

The net dipole moment of two downwards-pointing Ga-H bonds gets canceled equally with that of the dipole moment of an upwards-pointing Ga-H bond.

The charged electron cloud stays uniformly distributed; hence, GaH3 is overall non-polar.


Also, check –

How to identify polar or nonpolar compounds?

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