A student investigated the voltage produced by different pairs of metal electrodes in a chemical cell.
One electrode was always made of iron (Fe\text{Fe}Fe). The other electrode (Electrode A) was varied. Both electrodes were placed in a 1.0 mol/dm31.0\text{ mol/dm}^31.0 mol/dm3 sodium chloride solution.
The table below shows the results of the investigation:
| Electrode A | Symbol of metal | Voltage in volts |
|---|---|---|
| Aluminium | Al\text{Al}Al | +1.22+1.22+1.22 |
| Copper | Cu\text{Cu}Cu | −0.78-0.78−0.78 |
| Iron | Fe\text{Fe}Fe | 0.000.000.00 |
| Magnesium | Mg\text{Mg}Mg | +1.93+1.93+1.93 |
| Tin | Sn\text{Sn}Sn | −0.30-0.30−0.30 |
Write the symbols of the five metals in the table in order of reactivity, from most reactive to least reactive. Justify your answer.