In which of the following species is the cent | vedclass

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(D) To determine the number of valence electrons around the central atom,we count the bonding electrons and lone pairs.$BF_4^-$: The $B$ atom has $4$

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$SF_4$

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(D) To determine the number of valence electrons around the central atom,we count the bonding electrons and lone pairs.$BF_4^-$: The $B$ atom has $4$ bonds and $0$ lone pairs,totaling $8$ electrons.$NCl_3$: The $N$ atom has $3$ bonds and $1$ lone pair,totaling $8$ electrons.$PCl_4^+$: The $P$ atom has $4$ bonds and $0$ lone pairs,totaling $8$ electrons.$SF_4$: The $S$ atom has $4$ bonds and $1$ lone pair,totaling $10$ electrons $(4 	imes 2 + 2 = 10)$.Since $SF_4$ has $10$ valence electrons around the central $S$ atom,it is a hypervalent compound and does not follow the octet rule.

In which of the following species is the central atom $NOT$ surrounded by exactly $8$ valence electrons?

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