Question

what is electrochemical or reactivity series

Answer 1

the reactivity series is a series of metals, in order of reactivity from highest to lowest. It is used to determine the products of single displacement reactions, whereby metal A will replace another metal B in a solution if A is higher in the series.
hope this will help you....

Answer 2

When metals are arranged in decreasing order of their reactivity is said to be reactivity series. It let us know the potential of reaction of metal.