Matter - Isotope same of protons but different of...

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What is Matter? “Matter” is mostly empty space Atomic Number = # of protons in nucleus Atomic Mass Number = # of protons + neutrons
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Unformatted text preview: Isotope: same # of protons but different # of neutrons. (4He, 3He) Molecules: consist of two or more atoms (H2O, CO2)...
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