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This chemical element has atomic number 91.

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Your new ahaProtactinium

Protactinium has 91 protons in every atomic nucleus. Changing that number would make a different element. Source: Protactinium ↗

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More from Atomic Numbers and Elements

A few more worth knowing.

  1. 92This chemical element has atomic number 92.RECALL
    Uranium

    Symbol U

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  2. 93This chemical element has atomic number 93.RECALL
    Neptunium

    Symbol Np

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  3. 94This chemical element has atomic number 94.RECALL
    Plutonium

    Symbol Pu

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