PCl5 exists but NCl5 does not. This is because of

PCl₅ exists but NCl₅ does not. This is because of

A
High electronegativity of nitrogen
B
High ionisation energy of nitrogen
C
Smaller atomic size of nitrogen
D
Absence of d-orbitals in the valence shell of nitrogen

Solution:

The valency of an element depends on the availability of d-orbitals. The electrons may undergo excitation and expand the octet also.

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