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Why NF3 is pyramidal while BF3 is triang...

Why `NF_3` is pyramidal while `BF_3` is triangular planar though both are tetra atomic?

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`NF_3` has pyramidal shape. In its geometry, there are three bond pairs and one lone pair around nitrogen atom. Due to the presence of ione pair on nitrogen geometry is regarded as pyramidal. Which in `Bf_3` there are only three bond pairs. As there is no lone pair present in `BF_3` geometry is regular regarded as trigonal planar.
This is as represented in figures I and II.
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