Wikidata:Property proposal/Valence

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valence

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Originally proposed at Wikidata:Property proposal/Natural science

   Not done
Descriptionmeasure of an element's combining capacity with other atoms when it forms chemical compounds or molecules
Data typeQuantity
Domainchemical element (Q11344)
Allowed values[1, 2, 3, 4, 5, 6, 7]
Allowed units1
Example 1oxygen (Q629) → 2
Example 2lithium (Q568) → 1
Example 3hydrogen (Q556) → 1
Planned useto retrieve the valence value for each of chemical elements
Expected completenesseventually complete (Q21873974)
Robot and gadget jobsthis information can be collected and added automatically

Motivation

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Our team is currently investigating what people ask about the chemistry, and it seems that questions about valence of a chemical element are quite popular. In Wikidata there is a entity for valence valence (Q171407) but no property to store this information as far as I can see. There is a property with the same name valency (P5526), but this one is for another domain. I'd like to have a property for valence of a chemical element and then to fill it in for at least 118 existing chemical elements (so the requirement of the property to be used by at least 100 items will be satisfied. — Blokhin.nv (talk) 13:43, 10 March 2021 (UTC)[reply]

Discussion

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Can anyone please tell me if the property is going to be added after all? I'm still willing to add the information, but if nobody really needs it there, it's ok. Blokhin.nv (talk) 17:56, 8 June 2021 (UTC)[reply]

Sometimes contested votes take a long time to decide. It could be months more! Sorry. --99of9 (talk) 23:45, 3 April 2022 (UTC)[reply]
  •  SupportMasterRus21thCentury (talk) 20:06, 18 April 2022 (UTC)[reply]
  •  Strong oppose This is not a coherent concept or well-motivated proposal. I just reviewed the English wikipedia pages for several of the elements and NONE of them used the word "valency" or "valence" or provided any numerical value for this, or even discussed it aside from the oxidation state details. The enwiki page for valence - en:Valence (chemistry) provides two conflicting definitions, one from IUPAC which matches Jasper Deng's comment above, but another that allows for multiple values. Which of those definitions are we supporting here? That page also contains a table of "maximum valences" that goes up to 9 (so the limit of 7 proposed here is wrong). That page also notes a difference between valence and oxidation state but only in the context of a particular molecule. So this might be a supportable property as a qualifier for the elements contained in a molecule. Or it would be supportable if we restrict the definition only to "maximum valence" or "IUPAC valence", and I'd recommend replacement or additional examples to make that clear (for example Chlorine with value 7, Xenon 8, etc.). But as it currently stands, this proposal is definitely not ready to be acted on. ArthurPSmith (talk) 20:22, 20 April 2022 (UTC)[reply]
  •  Oppose as per users above, this is not a well defined concept and would need a much clearer definition to be useful. --Hannes Röst (talk) 14:32, 5 May 2022 (UTC)[reply]