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Technetium - its atomic number is 43.

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14y ago
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12y ago

Hydrogen , with the atomic number 1

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3y ago

Technetium, with atomic number Z = 43, is the lowest-numbered element in the Periodic Table for which all isotopes are radioactive. The second-lightest exclusively radioactive element, promethium , has atomic number 61. [27]

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Q: What is the name of the element with the lowest atomic number?
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