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.

Answer 1

$X_{11}-1s^{2}2s^{2}2p^{6}3s^1$

$Y_{17}-1s^{2}2s^{2}2p^{6}3s^{2}3p^5$

$Z_{10}-1s^{2}2s^{2}2p^6$

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 $XY$