$PCl _{5}$ એકદમ જાણીતું છે, પરંતુ $NCl _{5}$ નથી, કારણ કે-
JEE MAIN 2022, Easy
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b $PCl _{5}$ forms five bonds by using the d-orbitals to "expand the octet". But $NCl _{5}$ does not exist because there are no $d$-orbitals in the valence shell $\left(2^{\text {nd }}\right.$ shell). Therefore there is no way to expand the octet.
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