Ionization tendency of metal
The tendency of metals to lose electrons and become cations is called the ‘ionization tendency’. The ionization sequence is an ordered list of ionization trends.
The greater the ionization tendency of the metal, the easier it is to oxidize and the more reactive it is.
Conversely, metals with a low ionization tendency are more likely to be reduced. In other words, it tries to exist in metal state.
Comparison of reactivity of metals
The reactivity of metals can be compared to each other, depending on whether a metal is reacted in an aqueous solution of another metal ion.
If the reaction occurs when a metal is put into an aqueous solution of another metal ion, the reactivity of the inserted metal is more higher than the metal in solution.
If the reaction does not occur when the metal is put into an aqueous solution of another metal ion, the reactivity of the inserted metal is more lower than the metal in solution.