The fluorine atom surrounding the central sulphur atom protects the sulphur atom without allowing the water molecules to get in. Also, fluorine doesn't have vacant d− orbitals to accept the electron which is being donated by H2O . Thus SF6 stays to be kinetically inert.
Is SF6 kinetically more stable?
It is kinetically more stable.
What is meant by kinetically inert?
Kinetically inert means that the activation energy required for product formation is very high. Be and Mg have very less reduction potential E0 compared to other members of the same group. This indicates that they are less electropositive, hence do not reacts with cold water.
