Coinage Metal

Group IB
Copper (Cu) = 29                    3d104s1
Silver (Ag) = 47                      4d105s1
Gold (Au) = 79                       5d106s1

General configuration is (n -1) d10ns1 and being to d-block of periodic table i.e. coinage metals are transition metals.

Coinage metals have characteristics color.
Copper       →             red
Silver            →               white
Gold               →             yellow

They show common oxidation state of +1. Besides +1, copper has +2 and gold has +3 O.S.

They lie at the lower part of electrochemical series. So they are the least reactive metal and are found in native state