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iron group
In chemistry and physics, the iron group refers to elements that are in some way related to iron. These elements are relatively abundant both on Earth and elsewhere in the universe. The term is ambiguous in different contexts, and almost obsolete in chemistry.
==Periodic table==
The iron group in the periodic table referred to the elements iron, cobalt and nickel, that is the first row of group VIII (or VIIIB under the old numbering system.〔.〕) In modern numbering, the iron group appears as three columns numbered group 8, 9 and 10. These metals, and the platinum group immediately below them, were set aside from the other elements as they show obvious similarities among themselves in their chemistry, but are not obviously related to any of the other groups.
The similarities in chemistry along what is now known as the first row of the transition metals were noted by Adolph Strecker in 1859.〔.〕 Newlands' "octaves" (1865) were harshly criticized for separating iron from cobalt and nickel.〔.〕 Mendeleev stressed that groups of "chemically analogous elements" could have similar atomic weights as well as atomic weights which increase by equal increments, both in his original 1869 paper〔.〕 and his 1889 Faraday Lecture.〔.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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