Item:Q3308: Difference between revisions
Created a new Item: chemical element, species of atoms having the same number of protons in the atomic nucleus and the same chemical properties, but not nessarily the same mass, or the same stability (or half-lifetime if they are unstable) |
Created claim: instance of (P2): second-order class (Q23) |
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| Property / instance of | |||
| Property / instance of: second-order class / rank | |||
Normal rank | |||