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Group 9 element
Group of chemical elements / From Wikipedia, the free encyclopedia
Group 9, by modern IUPAC numbering,[1] is a group (column) of chemical elements in the d-block of the periodic table. Members of Group 9 include cobalt (Co), rhodium (Rh), iridium (Ir) and meitnerium (Mt).[2][page needed] These elements are among the rarest of the transition metals.[3]
Quick Facts 9 in the periodic table, IUPAC group number ...
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Like other groups, the members of this family show patterns in electron configuration, especially in the outermost shells, resulting in trends in chemical behavior; however, rhodium deviates from the pattern.