The reactivity series of metals is a list of metals arranged in order of their reactivity, from most reactive to least reactive. The reactivity of a metal is determined by its ease of oxidation, which is the loss of electrons.

The more reactive a metal is, the more easily it loses electrons and the higher it is on the reactivity series. The least reactive metals are at the bottom of the reactivity series and are more difficult to oxidize.

The reactivity series of metals is important because it can be used to predict the reactivity of metals in different situations. For example, a more reactive metal will react more quickly with oxygen to form an oxide layer, while a less reactive metal will react more slowly.

Here is a list of the most common metals in the reactivity series, from most reactive to least reactive:

* Potassium (K)

* Sodium (Na)

* Calcium (Ca)

* Magnesium (Mg)

* Aluminum (Al)

* Zinc (Zn)

* Iron (Fe)

* Nickel (Ni)

* Tin (Sn)

* Lead (Pb)

* Hydrogen (H)

* Copper (Cu)

* Silver (Ag)

* Gold (Au)

It is important to note that the reactivity series is not absolute and the reactivity of a metal can be affected by a number of factors, such as the temperature and the presence of other substances.