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The number of neutrons is never directly displayed.

For a given isotope of an element, the "top number" (e.g. 14C or carbon-14) is the Atomic Mass number, the total of neutrons and protons. To find the number of neutrons, subtract the atomic number from the isotopes atomic mass number. Here, 14C will have 8 neutrons.

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How many neutron does rutherfordium have?

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