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Chlorine · chemical symbol

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Chlorine has 17 protons in every atomic nucleus. Changing that number would make a different element. Source: Chlorine ↗

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  1. 18Argon · chemical symbolRECALL
    Ar

    Atomic number 18

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  2. 19Potassium · chemical symbolRECALL
    K

    Atomic number 19

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  3. 20Calcium · chemical symbolRECALL
    Ca

    Atomic number 20

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