Question

Arrange the metals in the decreasing order of reactivity.

Answer 1

The arrangement of metals in decreasing order of their reactivity is called an activity series.

Metals in decreasing order of reactivity:

$\mathrm{K}>\mathrm{Na}>\mathrm{Ca}>\mathrm{Mg}>\mathrm{Al}>\mathrm{Zn}>\mathrm{Fe}>\mathrm{Sn}>\mathrm{Pb}>\mathrm{H}>\mathrm{Cu}>\mathrm{Hg}>\mathrm{Ag}>\mathrm{Au}$

• Potassium is the most reactive metal while gold is the least reactive metal.
• The valence electron from potassium is removed easily and requires less energy. So, potassium is the most reactive in activity series.