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Neodymium · chemical symbol

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Neodymium has 60 protons in every atomic nucleus. Changing that number would make a different element. Source: Neodymium

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  1. 61Promethium · chemical symbolRECALL
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    Atomic number 61

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    Sm

    Atomic number 62

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  3. 63Europium · chemical symbolRECALL
    Eu

    Atomic number 63

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