The most variant groups of periodic table
Sure Group 11 is a group. And if you look in the right areas you see similarities between copper, silver and gold:

1)  Among the best electrical conductors even compared with other metals (http://eddy-current.com/conductivity-of-metals-sorted-by-resistivity/).

2)  Tend to prefer combining with "soft base" nonmetals:  Cu and Ag found as sulfides, gold is oxidized by $\ce{HNO_3}$ when a chloride source is added.

3)  Have some chemistry in the +1 oxidation state, especially wuth said soft-base nonmetals.