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ScienceOne small ahaElement

This chemical element has atomic number 18.

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Your new ahaArgon

Argon has 18 protons in every atomic nucleus. Changing that number would make a different element. Source: Argon ↗

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  1. 19This chemical element has atomic number 19.RECALL
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    Symbol K

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  2. 20This chemical element has atomic number 20.RECALL
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    Symbol Ca

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  3. 21This chemical element has atomic number 21.RECALL
    Scandium

    Symbol Sc

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