- Platinide
Platinide is a shorthand term for heavy Group 8A (see
periodic table of elements )metals that share some of the physical and chemical properties ofplatinum . These properties includecorrosion resistance (through the rapid formation of a thin, durableoxide layer), selectivechemical reactivity , a relatively highmelting point , goodmechanical strength , and goodelectrical conductivity . All are very rare in theEarth's crust , though somewhat more common in extraterrestrial sources likemeteorites , suggesting a degree ofsequestration in the planet's deeper layers due to high density andatomic weight .The elements of this group (in ascending order by
atomic number ) areruthenium ,rhodium ,palladium ,osmium ,iridium , andplatinum .
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