If A combines with F, what would be the formula of the resulting compound ?

A F

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A F_{2}

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A_{2} F

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A_{2} F_{3}

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Solution

The correct option is C $A_{2} F$
A has configuration $1 s^{2} 2 s^{1}$ where as F has $1 s^{2} 2 s^{2} 2 p^{4}$ .Here F needs 2 electrons to get stability where as A has to donate 1 electron to get stability.F always exists in diatomic that is oxygen gas.
$2 A + 0.5 F_{2} \to A_{2} O$ .

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