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Explain why PCl(5) is trigonal bipyramid...

Explain why `PCl_(5)` is trigonal bipyramidal whereas `IF_(5)` is square pyramidal ?

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`PCl_(5)`- The ground state and the excited state outer electronic configurations of phosphorous (Z=15) are represented below.

In `PCl_(5)`, P is `sp^(3)d` hybridised, therefore, its shape is trigonal bipyramidal.
`IF_(5)`- The ground state and the exicted state outer electronic configuration of iodine (Z=53) are represented below.

In `IF_(5)`, I is `sp^(3)d^(2)` hybridised, therefore, shape of `IF_(5)` is square pyramidal.
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Knowledge Check

  • The AsF_5 molecule is trigonal bipyramidal. The orbitals used by As for hybridisation are

    A
    `d_(x^(2)-y^(2)),d_(z^(2),s),p_(x,)p_(y)`
    B
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    C
    `s, p_(x),p_(y),p_(z),d_(z^(2))`
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