Which of the following atom has a valency of three?

Magnesium

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Fluorine

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Aluminium

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Carbon

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Solution

The correct option is D Aluminium
Aluminium with three valence electrons has a valency = $3$
Fluorine has seven valence electrons and has a valency = $1$
Magnesium has two valence electrons and has a valency = $2$
Carbon has four valence electrons and has a valency = $4$
So, option C is correct.

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