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we get information that how metal react with water ,acid and bases.We also get to know  about there features that they are highly reactive,moderately reactive or least reactive in nature.here I am giving you activity series of metal

potassium                      k

sodium                          Na

calcium                          Ca

magnesium                   Mg

aluminium                     Al

zinc                                Zn

iron                                 Fe

hydrogen                       H

copper                            Cu

mercury                          Hg

silver                               Ag

gold                                Au

through potassium to aluminium they are highly reactive

Through zinc to copper they are moderately reactive

Through silver to gold they are least reactive.

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