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Chemistry, 11.10.2020 19:01 fainet

Explore: Below the helium atom you see the isotope notation for helium-4. Add and subtract protons and neutrons a few times using the arrow buttons. Notice how the isotope notation changes when you do this. A. What does the top number equal?

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Explore: Below the helium atom you see the isotope notation for helium-4. Add and subtract protons a...
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