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'''Iridium''' is an [[element]] in the [[transition metal]]s class of the [[periodic table of the elements|periodic table]]. It is hard and lustrous, and is perhaps the most corrosion-resistant metal known. It has the second-highest density of all elements, after [[osmium]].
'''Iridium''' is an [[element]] in the [[transition metal]]s class of the [[periodic table of the elements|periodic table]]. It is hard and lustrous, and is perhaps the most corrosion-resistant metal known. It has the second-highest density of all elements, after [[osmium]].
An alloy of [[platinum]] and iridium was used in the international standard [[meter]] bar, before the standard was changed in 1960. A similar alloy is still used in the international standard [[kilogram]].
An alloy of [[platinum]] and iridium was used in the international standard [[International_System_of_Units#Meter|meter]] bar, before the standard was changed in 1960. A similar alloy is still used in the international standard [[International_System_of_Units#Kilogram|kilogram]].
[[Category:Elements]]
[[Category:Elements]]