Nucleus is composed of nucleotides on proton and neutron (nucleon), namely: that combination is called a nuclide (nuclide) atoms have the same number of protons within the nucleus. But there are a number of different neutron are called isotopes (isotope).Nuclear symbol is a symbol that represents the atomic number (number of protons) and the mass number (total number of protons, number of neutron). Is as follows:
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