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Printable version; In other projects ... Period. 1. Hydrogen 1 H ... periodic table; Template:Periodic table legend ...
Template: Periodic table ... Print/export Download as PDF; Printable version; ... This template does not show in mobile view, so is not fit for article body. ...
In the periodic table of the elements, each numbered row is a period. A period on the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.
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Periodic tables usually at least show the elements' symbols; many also provide supplementary information about the elements, either via colour-coding or as data in the cells. The above table shows the names and atomic numbers of the elements, and also their blocks, natural occurrences and standard atomic weights. For the short-lived elements ...
Bold text: in Periodic Table 1871 Italic text: in Periodic Table 1906 (the last by Mendeleev) Regular text (not bold) added after 1906 begin–end of 1871 Reihe
This form of periodic table is more congruent with the order in which electron shells are filled, as shown in the accompanying sequence (read from top to bottom, left to right). The placement of helium (a noble gas) above beryllium (an alkaline earth metal) ordinarily attracts strong criticism from chemists.
This is the template sandbox page for Template:Periodic table . See also the companion subpage for test cases . Template documentation [ view ] [ edit ] [ history ] [ purge ]