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The chemical elements are what the periodic table classifies and organizes. Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on. Each of these names can be further abbreviated by a one- or two-letter chemical symbol; those for hydrogen, helium, and lithium are respectively H, He, and Li. [6]
Usage Group 3 options (2021) Bare template pages (see also Periodic_table_(micro), the editor-friendly template).}) -- IUPAC WG preferred 2021}) -- enwiki PRE-2021, split d-block
Helium is found in large amounts in minerals of uranium and thorium, including uraninite and its varieties cleveite and pitchblende, [20] [137] carnotite and monazite (a group name; "monazite" usually refers to monazite-(Ce)), [138] [139] because they emit alpha particles (helium nuclei, He 2+) to which electrons immediately combine as soon as ...
Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity. For more detailed information about the origins of element names, see List of chemical element name etymologies.
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Hydrogen: Helium: Lithium: Beryllium: Boron: Carbon: ... (at 20° C) 0.5334 g/cm 3 [3] when ... Allotropes Appearance <element> IN THE PERIODIC TABLE Periodic table ...
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It was supported by IUPAC in a 1988 report [3] and reaffirmed in 2021. [8] Many textbooks however show group 3 as containing scandium, yttrium, lanthanum, and actinium, a format based on historically wrongly measured electron configurations: [ 4 ] Lev Landau and Evgeny Lifshitz already considered it to be "incorrect" in 1948, [ 5 ] but the ...