chemical iridium ir iridium ir element periodic table element chemistry science education physics school reference bohr atom matter basic information atomic structure isotopes facts related links mla format cite page home site comments help links window version table atomic number atomic mass electron configuration number neutron melt point boiling point date discovery crystal structure element groups alkali metal alkaline earth metals transition metal metal metalloids non metal halogens noble gas rare earth element basic information atomic structure isotopes related links cite page basic information iridium symbol ir atomic number atomic mass amu melting point c k f boiling point c k f number protons electrons number neutron classification transition metal crystal structure cubic density k g cm color white atomic structure number energy levels energy level second energy level energy level fourth energy level fifth energy level sixth energy level isotopes isotope half life day day day m hour hour stable day stable m day hour m day fact date discovery discoverer tenant origin latin word iridis rainbow uses tip gold pen crucible special container obtain gravel deposit platinum related links currently know link iridium let know mla format cite page bentor yinon chemical iridium information cite online source visit mla website page create yinon bentor use web site restrict site license agreement copyright yinon bentor rights reserve