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Chemistry-

General

Easy

Question

Valence electrons in the element $A$ are 3 and that in element $B$ are 6. Most probable compound formed from $A$ and $B$ is

$A_{2} B$
${A B}_{2}$
$A_{6} B_{3}$
$A_{2} B_{3}$

The correct answer is: $A subscript 2 end subscript B subscript 3 end subscript$

ElementValence electrons Possible ion
$A blank 3 blank A to the power of 3 plus end exponent$
$B blank 6 blank B to the power of 2 minus end exponent$
$B plus 2 e to the power of minus end exponent rightwards arrow B to the power of 2 minus end exponent$
8 electrons in valence shell (stable)
$A rightwards arrow A to the power of 3 plus end exponent plus 3 e to the power of minus end exponent$
Stable
Thus, $A to the power of 3 plus end exponent B to the power of 2 minus end exponent A subscript 2 end subscript B subscript 3 end subscript$

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