Both are almost equal in mass, 1 amu (atomic mass unit).
             Another subatomic particle in the atom is the electron. It is negatively charged and it's mass is about 2000 times smaller than that of a neutron or electron. Usually the number or electron in an atom is the same as the number of protons. So, usually the atoms have not a positive nor negative charge, but they are neutral.
             Electron are not in the nucleus like the protons and neutrons are. They travel at very high speeds throughout the atom in energy levels. The energy levels are like orbits that surround the nucleus.
             The number of protons that are in the nucleus of an atom is called the atomic number. The atomic number identifies the atom because no two atoms have the same number of protons in there nucleus. For example, hydrogen has the atomic number of 1, that means all atoms that have one proton in its nucleus is hydrogen.
             The atomic mass number is the number of neutrons and protons in the nucleus. To find the number on neutrons in an
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