True: when using vsepr theory to determine molecular shape, a triple bond counts as a single electron domain even though it consists of three shared electron pairs.
The fundamental idea behind VSEPR is that the valence electron pairs that surround an atom have a tendency to reject one another and would therefore arrange themselves in a way to minimise this repulsion. In turn, this lowers the energy of the molecule and raises its stability, which establishes the molecular geometry. The electron-electron repulsion resulting from the Pauli exclusion principle, rather than the electrostatic repulsion, has been stressed by Gillespie as being more significant in dictating molecule geometry.
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