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Radium · chemical symbol

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Radium has 88 protons in every atomic nucleus. Changing that number would make a different element. Source: Radium ↗

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  1. 89Actinium · chemical symbolRECALL
    Ac

    Atomic number 89

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    Th

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  3. 91Protactinium · chemical symbolRECALL
    Pa

    Atomic number 91

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