| NOUN | substance | radiothorium, thorium-228 | radioactive isotope of thorium with mass number 228 |
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| Meaning | radioactive isotope of thorium with mass number 228. | |
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| Synonym | thorium-228 | |
| Broader | thorium, Th, atomic number 90 | A soft silvery-white tetravalent radioactive metallic element |
| Spanish | radiotorio, torio 228, torio-228 | |
| Catalan | radiotorio | |
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