<P> Group 11 , by modern IUPAC numbering , is a group of chemical elements in the periodic table , consisting of copper ( Cu ) , silver ( Ag ) , and gold ( Au ) . Roentgenium ( Rg ) is also placed in this group in the periodic table , although no chemical experiments have yet been carried out to confirm that it behaves like the heavier homologue to gold . Group 11 is also known as the coinage metals , due to their former usage . They were most likely the first three elements discovered . Copper , silver , and gold all occur naturally in elemental form . </P>
what are some elements that are similar to silver
copper ( Cu ) gold ( Au ) Roentgenium ( Rg )