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ClF(3) exists but FCl(3) does not. Why ?...

`ClF_(3)` exists but `FCl_(3)` does not. Why ?

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Chlorine has vacant 3d-orbitals and an electron can be promoted from 3p filled orbital to 3d orbital. Thus, chlorine can show a cavalency of 3 in its compunds and a molecule of `ClF_(3)` can exist. But fluroine has no vacant 2d orbitals and can exhibit only cavalency of one in its compounds. Thus, a molecule of `FCl_(3)` fails to exist.
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