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2 August, 13:33

A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide? Superscript 53 subscript 78 upper I. Superscript 78 subscript 53 upper P t. Superscript 131 subscript 78 upper P t. Superscript 131 subscript 53 upper I.

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  1. 2 August, 15:07
    0
    its d
  2. 2 August, 15:53
    0
    if I'm correct, superscript is the atomic number, so 53
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