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The platinum-group metals ] are six noble, precious metallic elements clustered together in the periodic table. These elements are all transition metals in the d-block.
The six platinum-group metals are ruthenium, rhodium, palladium, osmium, iridium, and platinum. They have similar physical and chemical properties, and tend to occur together in the same mineral deposits. However, they can be further subdivided into the iridium-group platinum-group elements and the palladium-group platinum-group elements based on their behaviour in geological systems.
The three elements above the platinum group in the periodic table are all ferromagnetic; these, including the lanthanide element gadolinium, are the only known transition metals with this property.