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Q.
Which of the following molecules has pentagonal bipyramidal shape?
Punjab PMETPunjab PMET 2006Chemical Bonding and Molecular Structure
Solution:
In the formation of $XeF _{6}$ molecule, three $5 p$ electrons are promoted to $5 d$ orbitals. Now, one 5s, three $5 p$ and three $5 d$ orbitals of Xe atom intermix together and form seven $s p^{3} d^{3}$ hybrid orbitals. One sp ${ }^{3} d^{3}$ hybrid orbital contains one lone pair of electrons while other six are half-filled.
The expected geometry is pentagonal bipyramidal.
