Chemistry · May / June 2020 · Paper 12 · Question 14

The expression shown for the value of $A_r$ for fluorine is incomplete. $A_r(\text{fluorine}) = \dfrac{\text{average mass of one ......1...... of fluorine}}{......2......\text{ of the mass of one atom of }^{12}_{6}\text{C}}$ How should the gaps in the expression be correctly completed?

1. Agap 1: atom; gap 2: $\frac{1}{6}$
2. Bgap 1: atom; gap 2: $\frac{1}{12}$
3. Cgap 1: molecule; gap 2: $\frac{1}{6}$
4. Dgap 1: molecule; gap 2: $\frac{1}{12}$

As printed in the paper