Question

The electronic configuration of two elements $X$ and $Y$ is given below : $X=1s^{2}$, $2s^{2}2p^{6}$, $3s^{2}3p^{6}$, $4s^{2}$ $Y=1s^{2}$, $2s^{2}2p^{6}$, $3s^{2}3p^{5}$ The formula of the ionic compound that can be formed between these elements is

• A. $XY$
• B. $XY_2$
• C. $X_2Y$
• D. $XY_3$

Answer 1

Answer: (B)

$XY_2$

Answer 2

$X$ belongs to alkaline earth metal group $(= Ca)$, $\Upsilon$ belongs to halogen group $(= Cl)$. So, the possible ionic compound that can be formed is $CaCl_{2}$