The electronic configuration of two elements $X$ and $Y$ are given below:
$X = 2, 8, 2$
$Y = 2, 8, 7$
The formula of a compound that can be formed between these two elements is:

X Y

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X Y_{2}

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X_{2} Y

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X Y_{3}

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Solution

The correct option is C $X Y_{2}$
$X = 2, 8, 2 ⟶$ valance $e^{-} = 2$

$Y = 2, 8, 7 ⟶$ Valancy is = 1 electron

So, the compound will be $X Y_{2}$

Example $M g C l_{2}$

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The electronic configuration of two elements X and Y are given below:X=2,8,2Y=2,8,7The formula of a compound that can be formed between these two elements is:

The correct option is C XY2X=2,8,2⟶ valance e−=2Y=2,8,7⟶ Valancy is = 1 electronSo, the compound will be XY2Example MgCl2

The electronic configuration of two elements $X$ and $Y$ are given below:
$X = 2, 8, 2$
$Y = 2, 8, 7$
The formula of a compound that can be formed between these two elements is:

The correct option is C $X Y_{2}$
$X = 2, 8, 2 ⟶$ valance $e^{-} = 2$

$Y = 2, 8, 7 ⟶$ Valancy is = 1 electron

So, the compound will be $X Y_{2}$

Example $M g C l_{2}$