11th Class Chemistry Chemical Bonding and Molecular Structure Question Bank 11th CBSE Chemistry Chemical Bonding and Molecular Structure

  • question_answer A molecule of\[PC{{l}_{5}}\] exists while that of\[NC{{l}_{5}}\]  does not.

    Answer:

                    The valence shell electronic configurations of both N and P are as follows : Since nitrogen atom has no vacant 2d orbitals, it cannot extend its covalency to five. Therefore, a molecule of\[NC{{l}_{5}}\]does not exist. But in case of phosphorus, an electron can be promoted from 3s filled orbital to 3d vacant orbitals. Therefore, phosphorus can extend its covalency to five. Thus, a molecule of \[PC{{l}_{5}}\] can exist.


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