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This chemical element has atomic number 81.

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Your new ahaThallium

Thallium has 81 protons in every atomic nucleus. Changing that number would make a different element. Source: Thallium ↗

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More from Atomic Numbers and Elements

A few more worth knowing.

  1. 82This chemical element has atomic number 82.RECALL
    Lead

    Symbol Pb

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  2. 83This chemical element has atomic number 83.RECALL
    Bismuth

    Symbol Bi

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  3. 84This chemical element has atomic number 84.RECALL
    Polonium

    Symbol Po

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