Elements $X$ and $Y$ have $2$ and $6$ electrons in their valence shells,respectively. If they combine,what will be the possible formula of the compound formed?

Which of the following is incorrect for ionic compounds?

Magnesium reacts with an element $(X)$ to form an ionic compound. If the ground state electronic configuration of $(X)$ is $1s^{2} 2s^{2} 2p^{3},$ the simplest formula for this compound is

Provide the steps and their corresponding enthalpies for the formation of $NaCl$ (sodium chloride).

In a crystal,cations and anions are held together by

Write Lewis symbols for the following atoms and ions: $S$ and $S^{2-}$,$Al$ and $Al^{3+}$,$H$ and $H^{+}$.