An atom $\mathrm{X}$ has three electrons more than the noble gas configuration. Write the formula of its $\left(\mathrm{X}\right)$ 

$\left(\mathrm{i}\right)$ sulphate

$\left(\mathrm{ii}\right)$ nitrate

$\left(\mathrm{iii}\right)$ phosphate

$\left(\mathrm{iv}\right)$ carbonate

$\left(\mathrm{v}\right)$ hydroxide.

What type of compounds are usually formed between metals and non-metals and why?

An atom $\mathrm{X}$ has electronic configuration $2,8,7$. It combines with $\mathrm{Y}$ having $1$ electron in its outermost shell.

What type of bond will be formed between $\mathrm{X}$ and $\mathrm{Y}$.

An atom $\mathrm{X}$ has electronic configuration $2,8,7$. It combines with $\mathrm{Y}$ having $1$ electron in its outermost shell.

Write the formula of the compound formed.

Draw orbit structure diagram of sodium chloride $\left(\mathrm{NaCl}\right)$.

Draw orbit structure diagram of calcium oxide $\left(\mathrm{CaO}\right)$.

[Atomic numbers $\mathrm{Ca}=20, \mathrm{O}=8$]