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How many protons, electrons, and neutrons does an atom with atomic number of 20 and mass number of 40?

How many protons, electrons, and neutrons does an atom with atomic number of 20 and mass number of 40?
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How many protons, electrons, and neutrons does an atom with atomic number of 20 and mass number of 40?

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User Betehess
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There are 20 protons, neutrons and electrons in calcium
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User ContinuousLoad
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