In which of these molecules or ions is there only one lone pair of electrons on the central sulfur atom? in which of these molecules or ions is there only one lone pair of electrons on the central sulfur atom? sf4 so42− sof4 sf6 sf2?

The correct answer is SF4.

SF4 or Sulfur tetrafluoride. SF4 is the combination of 34 valence electrons. Around the Sulfur there are 5 electron pairs, in which there are 4 bonding pairs (with 4 flours) and one lone pair (non-bonding pair).

SO42- or sulfate ion have no lone pairs (all are bonding pairs).

SOF4 or Sulfuryl tetrafluoride have no lone pairs (S has 6 valence electrons, 1 for each S-F single bonds and 2 for the S=O double bond).

SF6 or Sulfur Hexafluoride also have no lone pairs (all of the 6 S electrons are bounded to 6 F).

SF2 or sulfur difluoride have four non-bonded electrons (or two lone pairs).

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