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 How many lone pairs are there in BrF5 ?

One lone pair.

Br atom has 7 valence electrons. 5 out of 7 valence electrons are used for formation of 5 bonds with 5 F atoms and 2 valence electrons of Br are present in the form of a lone pair.

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there is only 1 lone pair present in BrF5 
there are 7 electrons in Br valence shell from which 5 electrons went to make bond with F, while the remaining two makes a lone pair.
and thus anly 1 lone pair exist in BrF5.

Thumps Up if u understood!

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one

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