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physical object > natural object > particle > element > column grouped element > transition metal > iridium
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iridium comparison table
Subject has occurrence is a kind of has group has image has definition
siderophile elementin planet metallic core and associated with ironplanetary element  element that tend to concentrate in metallic iron
transition metal column grouped elementa column number in the table of the elements  
iridiumin planet metallic core and associated with ironsiderophile elementa column number in the table of the elements 

Next siderophile elementiron    Upsiderophile element, transition metal    Previous siderophile elementgold