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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
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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