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Promethium · chemical symbol

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Promethium has 61 protons in every atomic nucleus. Changing that number would make a different element. Source: Promethium ↗

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  1. 62Samarium · chemical symbolRECALL
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    Eu

    Atomic number 63

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  3. 64Gadolinium · chemical symbolRECALL
    Gd

    Atomic number 64

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