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The atomic number of nitrogen is 7. When it is a radioactive isotope you add the number of neutrons to the atomic number (equaling 15). You then write 15 over 7 next to a capital 'N' representing Nitrogen.

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What is the superscript and subscript of the nuclide of hafnium that contains 107 neutrons?

The superscript is the atomic mass number, which is the sum of protons and neutrons. The subscript is the atomic number, which is the number of protons. For a hafnium nuclide with 107 neutrons, the superscript would be 180 (107 neutrons + 73 protons) and the subscript would be 73.


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What is the isotope notation for thorium?

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Which is the nuclide notation for an atom with 13 protons and 5 neutrons?

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