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  4. Maximum covalency of an element of atomic number 7 is

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Q. Maximum covalency of an element of atomic number $7$ is

AIIMSAIIMS 1995Chemical Bonding and Molecular Structure

Solution:

The electronic configuration, of an element of atomic number 7, is $1s^{2}\,2s^{2}\,2p^{2}_{x},\,2p^{1}_{y}\,2p^{1}_{z}$. Thus the valency shell is second principal shell which has only four orbitals. Therefore the element can form maximum of four covalent bonds. Thus the covalency is 4.