Chemistry, 05.10.2021 07:50 AM28

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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