Answer Octet rule.
Why PF6 Not obey octet rule?
--In the PF6– molecule P not follows the octet here,
--it expands its valency and violates the octet.
From the octet calculation, it requires 56 electrons but the valence electrons are 48, so the remaining 8 electrons are accumulated by 8/2 = 4 bonds, but here P makes six bonds which is a violation of octet.
What is formal charge ?
--To find formal charges in a Lewis structure, for each atom, you should count how many electrons it "owns".
--Count all of its lone pair electrons, and half of its bonding electrons.
--The difference between the atom's number of valence electrons and the number it owns is the formal charge.
Learn more about lewis structure From https://brainly.com/question/20300458.
