Discussion
The number of bonding pairs and lone pairs of electrons in BrF5 molecule are respectively
Answer: D
BrF5 has 5 bonding pairs and 1 lone pair.
Bromine has 7 valence electrons. Five form bonds with the five fluorine atoms, leaving two electrons as one lone pair. Six electron pairs take an octahedral arrangement, and with one position occupied by the lone pair the molecule is square pyramidal.
Four bonding pairs would leave room for only four fluorine atoms, so the options with 4 or 3 bond pairs cannot describe BrF5.
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