The reactivity series and metal extraction
The reactivity series ranks metals from most to least reactive, and that single order predicts a lot: which metals displace others, how vigorously they react, and — crucially — the method needed to extract each from its ore.
Key facts
| Topic | Patterns in the Periodic Table |
| Most reactive | potassium, sodium, calcium… |
| Least reactive | …copper, silver, gold |
| Extraction | reactivity decides the method |
What the series predicts
A more reactive metal reacts more vigorously with water, acids and oxygen, and will displace a less reactive metal from its compound. Putting iron into copper(II) sulfate, for instance, displaces copper because iron is the more reactive of the two — a classic redox reaction.
Extraction depends on reactivity
How a metal is won from its ore follows its place in the series. Metals below carbon (such as iron, zinc, lead) can be extracted by reduction with carbon — cheaper and common. Metals above carbon (such as aluminium) are too reactive for that and must be extracted by electrolysis, which is more expensive. The least reactive metals (gold) occur native.
Iron and aluminium
Iron is reduced by carbon in the blast furnace. Aluminium, being more reactive than carbon, is extracted by electrolysis of its molten purified ore — which explains why aluminium was historically costly despite being abundant: the energy of electrolysis, not scarcity, sets the price.
Rusting and protection
Reactivity also explains corrosion. Iron rusts when exposed to both oxygen and water; you can prevent it by barrier methods (paint, oil) or by sacrificial protection — attaching a more reactive metal like zinc that corrodes in the iron's place.
Frequently asked questions
What does the reactivity series tell you?
How vigorously metals react and which metals displace others — a more reactive metal displaces a less reactive one from its compound.
Why are metals extracted differently?
Their reactivity decides the method: metals below carbon can be reduced by carbon; metals above carbon (like aluminium) need electrolysis.
Why is aluminium extracted by electrolysis?
It is more reactive than carbon, so carbon can't reduce it — electrolysis of its molten ore is required, which is energy-intensive and costly.
How can rusting be prevented?
By barrier methods (paint, oil) or sacrificial protection — attaching a more reactive metal such as zinc that corrodes instead of the iron.
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