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This chemical element has atomic number 90.

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Your new ahaThorium

Thorium has 90 protons in every atomic nucleus. Changing that number would make a different element. Source: Thorium ↗

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  1. 91This chemical element has atomic number 91.RECALL
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    Symbol Pa

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  2. 92This chemical element has atomic number 92.RECALL
    Uranium

    Symbol U

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  3. 93This chemical element has atomic number 93.RECALL
    Neptunium

    Symbol Np

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