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Find the total number of lone pairs of electrons present on the central atom, summed over the following species: [TeBr6]²-, [BrF2]+, SNF3 and [XeF3]- [Atomic numbers: N = 7, F = 9, S = 16, Br = 35, Te = 52, Xe = 54]

1. 4
2. 5
3. 6
4. 7

Correct answer: 6

Solution

Counting lone pairs on each central atom: Te = 1, Br = 2, S = 0, Xe = 3, giving a total of 6.

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