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Question
Explain why \[\ce{PCl5}\] is trigonal bipyramidal whereas \[\ce{IF5}\] is square pyramidal.
Solution
\[\ce{PC15}\] – The ground state and the excited state outer electronic configurations of phosphorus \[\ce{(Z = 15)}\] are represented below:
\[\begin{array}{cc}
\ce{Cl}\phantom{..}\ce{Cl}\\
\phantom{.}\backslash\phantom{.}|\phantom{}\\
\phantom{........}\ce{P - Cl}\\
\phantom{.}/\phantom{.}|\phantom{}\\
\ce{Cl}\phantom{..}\ce{Cl}
\end{array}\]
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