1. Tardigrade
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  4. Which one of the following pentafluorides cannot be formed?

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Q. Which one of the following pentafluorides cannot be formed?

The p-Block Elements - Part2

Solution:

$ Bi ^{5+}$ has lower stability than $Bi ^{3+}$ due to inert pair effect. Hence, $Bi$ forms trihalides rather than pentahalides.