Two elements X and Y have the following elect | vedclass

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(A) The electronic configuration of $X$ is $1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^2$. It has $2$ electrons in its outermost shell,so its valency is $+2$.The

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$XY_2$

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(A) The electronic configuration of $X$ is $1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^2$. It has $2$ electrons in its outermost shell,so its valency is $+2$.The electronic configuration of $Y$ is $1s^2, 2s^2 2p^6, 3s^2 3p^5$. It has $7$ electrons in its outermost shell,so it needs $1$ electron to complete its octet,making its valency $-1$.To form a neutral compound,the charges must balance. Thus,one atom of $X$ $(+2)$ combines with two atoms of $Y$ ($-1$ each) to form $XY_2$.

Two elements $X$ and $Y$ have the following electronic configurations: $X = 1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^2$ and $Y = 1s^2, 2s^2 2p^6, 3s^2 3p^5$. The expected compound formed by the combination of $X$ and $Y$ is:

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