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Nitrogen shows maximum covalency of 4 whereas, other heavier elements of the group show higher covalency because,
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it has only 4-orbitals available in the valence shell
Covalency of nitrogen is restricted to four due to absence of $d$-orbitals in its valence shell. Only four orbitals (one $2 s$ and three $2 p$-orbitals) are available in its valence shell.
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