The elements of group 9 of the periodic table are called the cobalt group. They are the elements cobalt, rhodium, iridium and meitnerium. Meitnerium, named after Lise Meitner, does not occur naturally. The other elements are metals.
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published June 2019 with articles on 43 elements (7 MB, 160 pages)
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last modified: 10.05.2021 16:29 H from N/A
