Two elements$\text{X}$ and $\text{Y}$ have following electronic configurations $\text{X}=1s^2,2s^{2}2p^6,3s^{2}3p^6,4s^2$ and

$\text{Y}=1s^2,2s^{2}2p^6,3s^{2}3p^5.$ The expected compound formed by combination of $\text{X}$ and $\text{Y}$ is