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PCl5 exists but NCl5 does not. Explain.

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PCl5 exists but NCl5 does not. Explain. 

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Nitrogen does not possess 2d - subshell and it cannot excite its 2s paired electron to get unpaired whereas phosphorus does so on account of availability of 3d - subshell. 

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Explain why PCl5 exists but NCl5 does not ?
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