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| physical object > natural object > collection of particles > phase of matter > solid > metal > actinide > transuranium element > neptunium |
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| neptunium comparison table | |||
| Subject | is a kind of | has image | has definition |
|---|---|---|---|
| transuranium element | synthetic element | A synthetic element with atomic number greater than 92 (uranium) | |
| neptunium | transuranium element |  |
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