Group 9 element

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Group 9
4 27
5 45
6 77
7 109

In modern IUPAC nomenclature, Group 9 of the periodic table contains the elements cobalt (Co), rhodium (Rh), iridium (Ir), and meitnerium (Mt). These are all d-block transition metals. All known isotopes of Mt are radioactive with short half-lives, and it is not known to occur in nature; only minute quantities have been synthesized in laboratories.


Explanation of right side periodic table slice: Transition metals atomic number in black are solids solid borders are older than the Earth (Primordial elements) dashed borders have no isotopes older than the earth


  • Alloys with other metals, primarially to add corrosion and wear resistance
  • Industrial Catalysts
  • Superalloys
  • Electrical Components


ar:عناصر المجموعة التاسعة ca:Grup 9 de la taula periòdica cs:9. skupina de:Cobaltgruppe eo:Elemento de grupo 9 ko:9족 원소 it:Elementi del gruppo 9 lmo:Grupp 9 de la taula periòdica sk:9. skupina sr:9. група хемијских елемената sh:9. grupa hemijskih elemenata th:ธาตุหมู่ 9

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