Common · Knowledge
Group 9 element
Group of chemical elements
Group 9, by modern IUPAC numbering, 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).
From Wikipedia
Group 9, by modern IUPAC numbering, 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). These elements are among the rarest of the transition metals, and as of 2025 rhodium and iridium are the only non-radioactive metals with higher prices per weight than gold. 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.
Text: Wikipédia, CC BY-SA 4.0. · Image: Alchemist-hp (talk) (www.pse-mendelejew.de) (FAL) ·
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Metal resistant to corrosion and oxidation in moist air, e.g. ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold