Discussion
The maximum number of covalent formed by nitrogen is
Answer: D
Nitrogen forms a maximum of four covalent bonds.
It has five valence electrons and no d-orbitals, so it can form three ordinary covalent bonds and one further coordinate bond by donating its lone pair - as in the ammonium ion \(\mathrm{NH_4^+}\). The absence of d-orbitals is why nitrogen cannot expand its octet as phosphorus does in \(\mathrm{PCl_5}\).
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