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Electron Gain Enthalpy

Why PCl5 exis...

Question

Why $P C l_{5}$ exist but not $N C l_{5}$

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Solution

$P C l_{5}$ forms five bonds by using the d-orbitals to "expand the octet" and have more "places" to put bonding pairs of electrons. $N C l_{5}$ does not exist because there are no d-orbitals in the second energy level. Therefore there is no way to arrange five pairs of bonding electrons around a nitrogen atom.

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{P C l}_{5}

{N C l}_{5}

P C l_{5}

N C l_{5}

does not because:

P C l_{5}

N C l_{5}

P C l_{5}

is possible but

N C l_{5}

is not possible.

Q. Find the number of molecule(s) which do not exist

N C l_{3}, P C l_{3}, P C l_{5}, N C l_{5}, P F_{2}, O F_{4}, O F_{6}

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