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Elements of the group have one s-electron in the outer electron shell. Hydrogen is not considered to be an alkali metal as it is not a metal, though it is more analogous to them than any other group. This makes the group somewhat exceptional. b The 14 f-block groups (columns) do not have a group number.
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The 2nd mentioning survived, Gruppe/group VIII was reduced from four columns to three (×) Published 1871, English version: "Reihen" translated as "Series" (that is, arrays with regularity not just rows).
b Group 18, the noble gases, were not discovered at the time of Mendeleev's original table. Later (1902), Mendeleev accepted the evidence for their existence, and they could be placed in a new "group 0", consistently and without breaking the periodic table principle. r Group name as recommended by IUPAC.
This is a documentation subpage for Template:Periodic table. It may contain usage information, categories and other content that is not part of the original template page. This periodic table is the prime form presented at this English wikipedia.