The sum of lone pairs present on the central atom of the interhalogen $\mathrm{IF}_{5}$ and $\mathrm{IF}_{7}$ is ____

JEE Main · 2023 · 10 Apr 2023 · Shift 1 · p-Block Elements

The sum of lone pairs present on the central atom of the interhalogen

IF_{5}

and

IF_{7}

is ____

Answer: 1

Solution

In iodine pentafluoride the central iodine uses five of its seven valence electrons to bond the five fluorine atoms, and the two electrons left over form a single lone pair, giving a square-pyramidal shape with one lone pair on iodine. In iodine heptafluoride all seven valence electrons of iodine are engaged in bonding the seven fluorine atoms, so no lone pair is left and the molecule is pentagonal bipyramidal. Adding the lone pairs on the two central atoms, one and zero, gives a total of one.

JEE Main · 2023 · 10 Apr 2023 · Shift 1 · Integer answer

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