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We get information about the metal that what kind of metal it is=highly reactive , moderately reactive or least reactive.here i am giving you a image of reactivity series.
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The activity series of metals is an empirical tool used to predict products in displacement reactions and reactivity of metals with water and acids in replacement reactions and ore extraction. It can be used to predict the products in similar reactions involving a different metal.

Metal                           Symbol
Lithium                         Li
Potassium                    K
Strontium                     Sr
Calcium                       Ca
Sodium                        Na
Magnesium                  Mg
Aluminum                     Al
Zinc                             Zn 
Chromium                   Cr
Iron                              Fe
Cadmium                    Cd
Cobalt                         Co
Nickel                          Ni 
Tin                              Sn
Lead                            Pb
Hydrogen gas             H2
Arsenic                        As
Bismuth                       Bi
Copper                        Cu
Mercury                       Hg
Silver                           Ag
Paladium                     Pd
Platinum                      Pt
Gold                            Au
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U should not copy directly from website ...but u made metal series so I'm not deleting ur answer this time ...
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