Valency of Boron in ${B F}_{3}$ molecules is _________.

zero

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one

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two

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three

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Solution

The correct option is D three
Electronic configuration of Boron is $1 s^{2} 2 s^{2} 2 p^{1}$
Outermost electronic configuration is $2 s^{2} 2 p^{1}$
3 electrons are valence electrons . So valency of Boron is '3'.

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