What is used to represent the $C=C$ bond in a ball and stick model?

When is the bond formed according to the $VB$ theory?

The electronic configuration of $X$ and $Y$ are given below:
$X: 1s^2 2s^2 2p^6 3s^2 3p^3$
$Y: 1s^2 2s^2 2p^6 3s^2 3p^5$
Which of the following is the correct molecular formula and type of bond formed between $X$ and $Y$?

Which of the following statements is correct for a covalent bond?

In which of the following does the central atom not follow the octet rule?

The number of electrons shared by each $N$ atom in the $N_2$ molecule is ...........