Which of the following statements is not true for ionic compounds?

An electrovalent compound is made up of

In which of the following species are the bonds non-directional?

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

The electronic configurations of elements are $A = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$ and $B = 1s^2 2s^2 2p^6 3s^2 3p^5$. Which of the following is the formula of the ionic compound that could be formed between these two elements $A$ and $B$?

Two elements have electronegativity of $1.2$ and $3.0$. The bond formed between them would be: