noble metal
metal resistant to corrosion and oxidation in moist air, e.g. ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold
AI overview
Noble metals are a group of elements—including gold, platinum, silver, and a few others—that resist rust and tarnish even when exposed to moisture and air. They matter because their resistance to corrosion makes them valuable for jewelry, industrial applications, and situations where durability and appearance need to be maintained over time.
AI-generated from the Wikipedia summary — may contain errors.
Article
Periodic table extract showing approximately how often each element tends to be recognized as a noble metal:
7 most often (Ru, Rh, Pd, Os, Ir, Pt, Au) 1 often (Ag) 2 sometimes (Cu, Hg) 6 in a limited sense (Tc, Re, As, Sb, Bi, Po)