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Fermium has 100 protons and electrons.

Number of neutrons = Atomic Mass of an isotope - Atomic number of the element

The atomic number of fermium is 100; but fermium has 17 isotopes, each with a different number of neutrons.

For the most stable isotope of fermium, 257Fm:

protons-100

electrons-100

neutrons-157

atomic mass per unit (AMU)-257

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