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- Q193099 subject Q19482053.
- Q193099 subject Q8758010.
- Q193099 abstract "A block of the periodic table of elements is a set of adjacent groups. The term appears to have been first used by Charles Janet. The respective highest-energy electrons in each element in a block belong to the same atomic orbital type. Each block is named after its characteristic orbital; thus, the blocks are: s-block p-block d-block f-block g-block (hypothetical)The block names (s, p, d, f and g) are derived from the spectroscopic notation for the associated atomic orbitals: sharp, principal, diffuse and fundamental, and then g which follows f in the alphabet.The following is the order for filling the "subshell" orbitals, according to the Aufbau principle, which also gives the linear order of the "blocks" (as atomic number increases) in the periodic table:1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, ...For discussion of the nature of why the energies of the blocks naturally appear in this order in complex atoms, see atomic orbital and electron configuration.The "periodic" nature of the filling of orbitals, as well as emergence of the s, p, d and f "blocks" is more obvious, if this order of filling is given in matrix form, with increasing principal quantum numbers starting the new rows ("periods") in the matrix. Then, each subshell (composed of the first two quantum numbers) is repeated as many times as required for each pair of electrons it may contain. The result is a compressed periodic table, with each entry representing two successive elements:".
- Q193099 thumbnail Periodic_table_blocks_spdf_(32_column).svg?width=300.
- Q193099 wikiPageWikiLink Q10693.
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- Q193099 wikiPageWikiLink Q193099.
- Q193099 wikiPageWikiLink Q19482053.
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- Q193099 wikiPageWikiLink Q8758010.
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- Q193099 comment "A block of the periodic table of elements is a set of adjacent groups. The term appears to have been first used by Charles Janet. The respective highest-energy electrons in each element in a block belong to the same atomic orbital type.".
- Q193099 label "Block (periodic table)".
- Q193099 depiction Periodic_table_blocks_spdf_(32_column).svg.