The atomic mass of two elements are given below.

Oxygen = $16 \mathrm{u}$

Sulphur = $32 \mathrm{u}$

What is the ratio by atomic mass of Sulphur and Oxygen in ${\mathrm{SO}}_2$?

The formula and charge on ions of three different compounds are shown below.

Two ions, ${\mathrm{Zn}}^{2+}$ and ${\mathrm{S}}^{2-}$, combine to form a compound. What should be the formula of the compound formed?

An ion is always a single charged atom.

An ion of a metal is always positively charged.

An ion of a non-metal is either positively or negatively charged?

The atomic mass of four elements are given below:

Molar mass is the mass of $1$ mole of an element or a compound. Which element has the highest molar mass?