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  4. Two elements X and Y have following electronic configurations X: 1s2 2s2 2p6 3s2 3p6 4s2 Y: 1s2 2s2 2p6 3s2 3p5 The expected compound formed by combination of X and Y will be expressed as

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Q. Two elements $X$ and $Y$ have following electronic configurations
$X: 1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{6}\,4s^{2}$
$Y: 1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{5}$
The expected compound formed by combination of $X$ and $Y$ will be expressed as

Chemical Bonding and Molecular Structure

Solution:

Valency of element $X$ is $2$ (electrons in the outermost shell) while that of element $Y$ is $1$ (electron required in the outermost shell to complete octet). So, the formula of the compound between $X$ and $Y$ is $XY_{2}$
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