(A) The central atom in $NF_3$ is nitrogen $(N)$.Nitrogen has $5$ valence electrons.In $NF_3$,nitrogen forms $3$ sigma bonds with $3$ fluorine atoms a

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(A) The central atom in $NF_3$ is nitrogen $(N)$.Nitrogen has $5$ valence electrons.In $NF_3$,nitrogen forms $3$ sigma bonds with $3$ fluorine atoms and has $1$ lone pair.The total number of electron pairs around the nitrogen atom is $3 + 1 = 4$.Since the steric number is $4$,the hybridisation of the nitrogen atom is $sp^3$.