• Question: whats the biggest atom , and how big is it

    Asked by to Greig on 19 Jun 2014. This question was also asked by .
    • Photo: Greig Cowan

      Greig Cowan answered on 19 Jun 2014:

      It depends what you mean. If you mean by volume, then caesium-55 is the largest. The 55 after the name is the atomic number: the number of protons in the nucleus (or electrons that orbit the nucleus). If you are talking about mass then it is livermorium-293. There are a few heavier elements, but evidence for them being created in the lab is still a bit sketchy.

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