Which one of $PC{l}_{4}^{+}$ and $PC{l}_{4}^{-}$ is not likely to exist and why?

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#2 | 15th Group: Properties: II
#3 | 15th Group: Ammonia

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group 15 ,preparation and properties

$PC{l}_{4}^{-}$, because P has 10 electrons which cannot be accommodated in $s{p}^{3}$ hybrid orbitals.

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