| NOUN | substance | actinide series | (chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium |
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| Meaning | (chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium. | |
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| Category | chemistry, chemical science | The science of matter |
| Broader | series | Similar things placed in order or happening one after another |
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