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synthetic element. Atomic number color: black=solid. 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.
The elements in group 13 are also capable of forming stable compounds with the halogens, usually with the formula MX 3 (where M is a boron-group element and X is a halogen.) [14] Fluorine , the first halogen, is able to form stable compounds with every element that has been tested (except neon and helium ), [15] and the boron group is no exception.
In chemistry, a free element is a chemical element that is not combined with or chemically bonded to other elements. Examples of elements which can occur as free elements include the oxygen molecule (O 2) and carbon. [1] They hardly ever bond with other atoms. [citation needed] Other examples of free elements include the noble metals gold and ...
Group 10 elements are observed in oxidation states of +1 to +4.[2] The +2 oxidation state is common for nickel and palladium, while +2 and +4 are common for platinum. Oxidation states of -2 and -1 have also been observed for nickel[3][4] and platinum,[5] and an oxidation state of +5 has been observed for palladium[6] and platinum.[7]
Oxygen (in a gas-filled tube) Group 16 is the third last group in the periodic table. This group is called the oxygen family or the chalcogens. The elements in this group are oxygen, sulfur, selenium, tellurium, polonium and livermorium. The first two elements are nonmetals, elements are in between are metalloids and the last two are metals ...
The platinum-group metals ( PGMs ), also known as the platinoids, platinides, platidises, platinum group, platinum metals, platinum family or platinum-group elements ( PGEs ), are six noble, precious metallic elements clustered together in the periodic table. These elements are all transition metals in the d-block (groups 8, 9, and 10, periods ...
In some cases, the average oxidation state of an element is a fraction, such as 8 / 3 for iron in magnetite Fe 3 O 4 . The highest known oxidation state is reported to be +9, displayed by iridium in the tetroxoiridium(IX) cation (IrO + 4). It is predicted that even a +10 oxidation state may be achieved by platinum in tetroxoplatinum(X), PtO 2+ 4.
