Wikidata entity: P9998
| P31 | instance of | ... | Q21077852 (Wikidata property for physical quantities) | Wikidata property for physical quantities |
| P31 | instance of | ... | Q22981316 (Wikidata property related to physics) | Wikidata property related to physics |
| P6104 | maintained by WikiProject | ... | Q8487193 (WikiProject Physics) | WikiProject Physics |
| P2302 | property constraint | ... | Q19474404 (single-value constraint) | single-value constraint |
| P2302 | property constraint | ... | Q21503247 (item-requires-statement constraint) | item-requires-statement constraint |
| P2302 | property constraint | ... | Q21510860 (range constraint) | range constraint |
| P2302 | property constraint | ... | Q21514353 (allowed units constraint) | allowed units constraint |
| P2302 | property constraint | ... | Q53869507 (property scope constraint) | property scope constraint |
| P2302 | property constraint | ... | Q52004125 (allowed-entity-types constraint) | allowed-entity-types constraint |
| P3254 | property proposal discussion | Url | Wikidata:Property proposal/excitation energy - Wikidata | ??? |
| P1659 | related property | ... | P2260 (ionization energy) | ionization energy |
| P1629 | Wikidata item of this property | ... | Q568593 (excitation energy) | excitation energy |
| P1855 | Wikidata property example | ... | Q18845090 (nickel-54) | nickel-54 |
| P1855 | Wikidata property example | ... | Q2373354 (technetium-99m) | technetium-99m |
| P1855 | Wikidata property example | ... | Q108839897 (nickel-54m) | nickel-54m |
| P1855 | Wikidata property example | ... | Q27624886 (Hoyle state) | Hoyle state |
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