Which of the following statements is correct?

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(A) In $SF_6$,the sulfur atom is bonded to $6$ fluorine atoms by $6$ single covalent bonds. Each bond consists of $2$ electrons,so the total number of

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The number of electrons present in the valence shell of $S$ in $SF_6$ is $12$.

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(A) In $SF_6$,the sulfur atom is bonded to $6$ fluorine atoms by $6$ single covalent bonds. Each bond consists of $2$ electrons,so the total number of electrons in the valence shell of $S$ is $6 	imes 2 = 12$. This is an example of an expanded octet,which does not obey the octet rule.Ionic reactions are generally very fast because they involve the interaction of ions already present in solution.According to $VSEPR$ theory,$SnCl_2$ has $2$ bond pairs and $1$ lone pair on the central $Sn$ atom,resulting in a bent (angular) geometry,not linear.The ability to form ionic compounds is related to the electropositivity of the metal. $Na$ is more electropositive than $Mg$,which is more electropositive than $Al$. Therefore,the order of ability to form ionic compounds is $Na^{+} > Mg^{2+} > Al^{3+}$.Thus,the correct statement is $A$.

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