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Variable Valency Representing

11,17,10 are...

Question

$11, 17, 10$ are the atomic number of elements $X, Y,$ and $Z .$
Write the molecular formulae of the compound formed when any two of the above element are combined.

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Solution

$X_{11} - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$
$Y_{17} - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}$
$Z_{10} - 1 s^{2} 2 s^{2} 2 p^{6}$

from above possible ions are

$X \to X^{+} + e -$ and $Y + e^{-} \to Y^{-}$

molecular formulae of the compound formed when X and Y combine is $X Y$

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