The elements commonly considered as noble metals are gold (Au), silver (Ag), and the six platinum group metals: ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and platinum (Pt). Sometimes, copper (Cu) and mercury (Hg) are also included as noble metals in broader definitions, but the core list primarily consists of the platinum group metals along with gold and silver.
