English: Periodic table extract showing approximately how often each element tends to be recognized as a noble metal:

Color guide

 7  most often (Ru, Rh, Pd, Os, Ir, Pt, Au)^[1]

 1  often (Ag)^[2]

 2  sometimes (Cu, Hg)^[3]

 6  in a limited sense (Tc, Re, As, Sb, Bi, Po)

The thick black line encloses the seven to eight metals most often to often so recognized. Silver is sometimes not recognized as a noble metal on account of its greater reactivity.^[4]

Marker guide

* may be tarnished in moist air or corrode in an acidic solution containing oxygen and an oxidant

† attacked by sulfur or hydrogen sulfide

§ self-attacked by radiation-generated ozone

References