is well known but is not. Because,

Question

is well known but  is not. Because,

Canvas Classes · Accepted Answer

exists because P has vacant 3d orbitals that can be used for bonding, allowing P to expand its octet and form 5 bonds (sp³d hybridization).

does NOT exist because N is in Period 2 and has no d-orbitals available. Nitrogen's maximum covalence is 4 (using s and p orbitals only). It cannot expand its octet.

Answer: Option (1) — N does not have vacant d-orbital

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