If you think to the atomic number this is 94 for plutonium.
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The chemical symbol of fermium is Fm; as a subscript in the isotopes symbols is atomic number.
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.
The number placed below an element's symbol in a chemical formula is called a subscript. Subscripts indicate the number of atoms of that element in a molecule.
The subscript for argon (Ar) is 18, which indicates the number of protons in the nucleus of an argon atom.
the same number of protons cuz elements are neutralPlutonium has 94 electrons.