Talk:Q568
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Autodescription — lithium (Q568)
description: chemical element with symbol Li and atomic number 3
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- Report on constraint conformation of “lithium” claims and statements. Constraints report for items data
For help about classification, see Wikidata:Classification.
- Parent classes (classes of items which contain this one item)
- lithium (Q568)
- alkali metal (Q19557)
- metal (Q11426) (@)→
- water-reactive substance (Q7973224)
- simple substance (Q2512777)
- s-block (Q208106)
- block (Q193099)
- categorization (Q912550)
- cognition (Q2200417)
- categorization (Q912550)
- block (Q193099)
- →(@) metal (Q11426)
- alkali metal (Q19557)
- lithium (Q568)
- Subclasses (classes which contain special kinds of items of this class)
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lithium⟩ on wikidata tree visualisation (external tool)(depth=1) - Generic queries for classes
- See also
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{{Item documentation}}.
Standard atomic weight[edit]
@LiberatorG:, re [1]. The source as published by Commission on Isotopic Abundances and Atomic Weights (Q15647945) (CIAAW), states that standard atomic weight (Q28912964) is a relative atomic mass (Q41377). i.e., has no unit or unit "1". More CIAAW publications state this ([https://www.degruyter.com/document/doi/10.1515/pac-2017-1002/html). Please revert. -DePiep (talk) 18:47, 22 November 2021 (UTC)
- @LiberatorG: Same for {sulfur (Q682) [2]. The 2013 source says (p. 267, section 1.1 Atomic weight of an element: "The atomic weight (also called the relative atomic amass) of isotope ... is ...". It is using two masses (eg expressed in with unit Da), and devides them so no unit remains (hence the word "relative"). The name is "[Standard] Atomic Weight", which is historically, and not fully correct (it is a mass, still dimensionless). This name was never changed by the institute. Easy check: nowhere in the source does the Ar have a unit (no Da in sight). -DePiep (talk) 18:58, 22 November 2021 (UTC)
- @DePiep: You are correct that standard atomic weight (Q28912964) and relative atomic mass (Q41377) are unitless. However Wikidata does not have a property for those. Instead, Wikidata uses the mass (P2067) property. A standard atomic weight (Q28912964) or relative atomic mass (Q41377) can be expressed as a mass simply by adding the dalton unit. Therefore a separate property is not necessary, because a mass (P2067) property with a unit of daltons is the same as the number by itself as a standard atomic weight (Q28912964) or relative atomic mass (Q41377). –LiberatorG (talk) 20:21, 22 November 2021 (UTC)
- Then either add such a property or allow dimensionless values in mass (P2067). CIAAW is quite a serious source, WD is to follow. -DePiep (talk) 10:09, 23 November 2021 (UTC)
- Of course CIAAW is a serious source; where was that disputed? But even CIAAW uses daltons when they list mass (as opposed to atomic weight). For example, CIAWW lists the atomic mass of the isotopes at [3], where they state "All atomic masses of nuclides, ma, are expressed in daltons (symbol Da), which is 1/12 mass of a single carbon-12 atom (unbound, neutral, in its electronic and nuclear ground state, and at rest)". –LiberatorG (talk) 11:28, 23 November 2021 (UTC)
- Then either add such a property or allow dimensionless values in mass (P2067). CIAAW is quite a serious source, WD is to follow. -DePiep (talk) 10:09, 23 November 2021 (UTC)
- @DePiep: You are correct that standard atomic weight (Q28912964) and relative atomic mass (Q41377) are unitless. However Wikidata does not have a property for those. Instead, Wikidata uses the mass (P2067) property. A standard atomic weight (Q28912964) or relative atomic mass (Q41377) can be expressed as a mass simply by adding the dalton unit. Therefore a separate property is not necessary, because a mass (P2067) property with a unit of daltons is the same as the number by itself as a standard atomic weight (Q28912964) or relative atomic mass (Q41377). –LiberatorG (talk) 20:21, 22 November 2021 (UTC)
- @LiberatorG: Same for {sulfur (Q682) [2]. The 2013 source says (p. 267, section 1.1 Atomic weight of an element: "The atomic weight (also called the relative atomic amass) of isotope ... is ...". It is using two masses (eg expressed in with unit Da), and devides them so no unit remains (hence the word "relative"). The name is "[Standard] Atomic Weight", which is historically, and not fully correct (it is a mass, still dimensionless). This name was never changed by the institute. Easy check: nowhere in the source does the Ar have a unit (no Da in sight). -DePiep (talk) 18:58, 22 November 2021 (UTC)