Question

in which of the following species central atom is NOT surrounded by 8 valence electrons ?
1.Bf4
2.NCl3
3.PCl4
4 . Sf4​

Answer 1

Answer:

Sf4

Explanation:

SF4 have SP3d hybridization ..S have 6 valance electrons and attached with 4 F atoms by covalent bond it means 4 valance electrons of S participate in covalent bond formation and remaining 2 present as lone pair....so number of electrons by which central atom is  surrounded= 6(valance electron of central atom) + 4 (acquired by F )= 10 electrons....

Sulfur tetrafluoride has 10 electrons around the central sulfur atom. This means there are five electron pairs arranged in an trigonal bipyramidal shape

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