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Samuel C


Date added:

November 20, 2016








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Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. Electrons travel around the center of the atom, which is called the nucleus. Kind of like how Earth revolves around the sun. Protons and nuetrons make up the center of the atom. The atom has an atomic number...
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Scientists find that number by counting how many protons are in the nucleus. In this case Helium has two protons. Scientists find the average atomic mass by adding up protons and neutrons many times. Then they divide the total by how many times they tried this. This time Helium has an average of 4 protons and neutrons in the center...
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