what is the reactivity seres

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.

Here is a series of some of the most common metals, listed in descending order of reactivity:

Metals	Metal Ion	Reactivity
K	K+	reacts with water
Na	Na+
Ba	Ba2+
Sr	Sr+
Ca	Ca2+
Li	Li+
Mg	Mg2+	reacts with acids
Al	Al3+
Mn	Mn2+
Zn	Zn2+
Cr	Cr2+
Fe	Fe2+
Cd	Cd2+
Co	Co2+
Ni	Ni2+
Sn	Sn2+
Pb	Pb2+
H2	H+	included for comparison
Sb	Sb3+	highly unreactive
Bi	Bi3+
Cu	Cu2+
Hg	Hg2+
Ag	Ag+
Pt	Pt+
Au	Au3+