(solved)Why is BF3 triagonal planar and PF3 triagonal pyramidal?. . . . .

Because, boron has 3 , and phosphor has 5 . If we are talking about molecule with 3 chlorine atoms then all of boron valence electrons are included in covalent bond, also 3 phosphor valence electrons are included in covalent bond. We can conclude that phosphor has 2 free electrons (one electron pair).
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Answer to Why is BF3 triagonal planar and PF3 triagonal pyramidal? . . .

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