Question

how 12 electrons are present in the outermost shell of SF6?

Answer 1

Hey ya frnd....here is ur answer!!ʕ•ٹ•ʔ

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It's a limitation of octet rule.Octet rule is only a guideline at best n' nthng more.

There r many compounds in which the stability of a molecule is not governed by the presence of octet configuration in central atom, n' in most of the cases the Central atom is generally S and P.
In these cases either the central atom has 6 e- or sometimes the e- count exceeds 8 to 10 or 12 e- in its valence e- shell.
For doing so(to hold more than 8 e-) S n' P expand their Octet and the term for this octet expansion is ‘Hyper valency’.

#TheRogueNinja

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I hope this will help u...☺️^-^☺️

Answer 2

SF6 is square bipyramidal in shape in which each fluorine is attached by single bond to sulphur. The presence of fluorine atom creates steric hindrance around sulphur atom, making it stable against external reactive species. The entire electrons present in the outermost shell (3s and 3p) of Sulphur are engaged in bonding. Therefore attain stable structure.