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Predict the formula of a compound which is formed by the element ‘X’
from group 13 and the other element ‘Y’ from group 16.

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X_{2} Y_{3}

X_{3} Y_{2}

{XY}_{2}

answer is A.

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Detailed Solution

Reason: Valency of X (group 13) = 3 as they contain 3 electrons in the valence shell.

Valency of Y (group 16) = 2 as they contain 6 electrons in their outermost valence shell and accept 2 electrons. Question Image

Since $8 - x = (8 - 6) = 2$

$∴$ Formula is $X_{2} Y_{3}$

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