Write the number of electrons, protons and neutrons with valance electron and valency from the element 1 to 20 according to their atomic numbers and mass numbers
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The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
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