Wikidata:Property proposal/Koordinationszahl
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coordination number[edit]
Originally proposed at Wikidata:Property proposal/Natural science
| Description | number of atoms, molecules or ions bonded to in a molecule or crystal |
|---|---|
| Represents | coordination number (Q397226) |
| Data type | Quantity |
| Allowed values | natural numbers |
| Allowed units | none |
| Example 1 | actinium (Q1121) with ionic radius (P10685)=112 pm and charge number=+3 → 6 |
| Example 2 | silver (Q1090) with ionic radius (P10685)=100 pm and charge number=+1 → 4 |
| Example 3 | silver (Q1090) with ionic radius (P10685)=94 pm and charge number=+2 → 6 |
| Example 4 | oxygen (Q629) with ionic radius (P10685)=142 pm and charge number=-2 → 8 |
| Planned use | Fill in Informations on ionic radii on the elements |
Motivation[edit]
The Property is needed as a Qualifier in combination with a Qualifier of the charge number to discribe the Property ionic radius (P10685) of an Element correctly. See also Wikidata:Property proposal/Ladungszahl. Meinichselbst (talk) 15:21, 25 April 2022 (UTC)
Discussion[edit]
Notified participants of WikiProject Chemistry
Comment You are proposing these as qualifiers, so this is in the context of the element within a specific molecule or compound? Can you clarify with more complete examples of how you think this would be used? ArthurPSmith (talk) 17:59, 26 April 2022 (UTC)
- Hi ArthurPSmith, the ionic radius depends on at least two factors: The charge of the ion and the coordination number. (Also, it depends on high or low spin in some cases, but I do not know how to introduce it.) Such, you have for Silver at least 6 values for the ionic radius:
- Ag+1 with a coordination number of 4 has an ionic radius of 100 pm
- Ag+1 with a coordination number of 6 has an ionic radius of 115 pm
- Ag+1 with a coordination number of 8 has an ionic radius of 128 pm
- Ag+2 with a coordination number of 4 has an ionic radius of 79 pm (in a square planar molecular geometry)
- Ag+2 with a coordination number of 6 has an ionic radius of 94 pm
- Ag+3 with a coordination number of 6 has an ionic radius of 75 pm
- By that, the value of i.e. 100 pm for silver does not help anyone. The interestet person needs also the coordination number as well as the charge number. Only with them one can introduce the right value for an ionic radius into the data of an element. As a result, silver (Q1090) would have at least the above stated 6 values for the property ionic radius (P10685). You can find a more or less complete list of ionic radii here.
- For further questions, please ask. --Meinichselbst (talk) 20:05, 26 April 2022 (UTC)
- Hi ArthurPSmith, the ionic radius depends on at least two factors: The charge of the ion and the coordination number. (Also, it depends on high or low spin in some cases, but I do not know how to introduce it.) Such, you have for Silver at least 6 values for the ionic radius:
Support Ok, I see the purpose now, thanks. We do have some items that are for the ions themselves (silver cation (Q75008432) I assume is meant to be Ag+1) where maybe the charge would already be specified, but those don't seem to be very plentiful or consistent here, so I guess it's fine to put these statements on the elements. ArthurPSmith (talk) 20:40, 26 April 2022 (UTC)- Support meanwhile charge number (P10764) has been created. Pamputt (talk) 22:14, 15 May 2022 (UTC)
@Meinichselbst, ArthurPSmith, Pamputt: 
Done Now coordination number (P10795). --Lymantria (talk) 15:51, 5 June 2022 (UTC)