A chemical that undergoes reactions easily is said to be reactive.
It shows the metals in order with the most reactive at the top.
The Reactivity Series is grouped based on whether the metal reacts with oxygen, water and acids. If two metals come out equal based on this, we look at how fast they react.
The most reactive metals are the alkali metals - group I of the periodic table. As you move down this group, the reactions get more violent.
The group I metals are called 'alkali metals'; when they react with water they form an alkali solution.
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