Question
Why $\mathrm{NF}_3$ is pyramidal but $\mathrm{BF}_3$ is triangular planar?
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Answer
In $\mathrm{NF}_3, \mathrm{~N}$ is surrounded by three F atoms and a lone pair thus, have lp -bp repulsion along with bp-bp repulsion.
Thus, its shape is pyramidal.
In $\mathrm{BF}_3, \mathrm{~B}$ is surrounded by only three F atoms, i.e. have no lone pairs, so only repulsion present in it is bp-bp.
Thus, its shape is triangular planar.
Thus, its shape is pyramidal.
In $\mathrm{BF}_3, \mathrm{~B}$ is surrounded by only three F atoms, i.e. have no lone pairs, so only repulsion present in it is bp-bp.
Thus, its shape is triangular planar.
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