State the number of valence electrons, the group number and the period number of each element in the following table.

Element	Valence electrons	Group number	Period number
Sulphur
Oxygen
Magnesium
Hydrogen
Fluorine
Aluminium

Identify the element that has the lower ionisation energy in each pair of the following.

$\mathrm{Mg} \mathrm{or} \mathrm{Na}$

Identify the element that has the lower ionisation energy in each pair of the following.

$\mathrm{Li} \mathrm{or} \mathrm{O}$

Identify the element that has the lower ionisation energy in each pair of the following.

$\mathrm{Br} \mathrm{or} \mathrm{F}$

Identify the element that has the lower ionisation energy in each pair of the following.

$\mathrm{K} \mathrm{or} \mathrm{Br}$

In period $2$, element $\mathrm{X}$ is to the right of the element $\mathrm{Y}$. Then, find which of the elements have:

Low nuclear charge.

In period $2$, element $\mathrm{X}$ is to the right of the element $\mathrm{Y}$. Then, find which of the elements have:

Low atomic size