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how to find atomic mass, atomic number, and number of neutrons of an element, using periodic table?
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- 1 decade agoFavorite Answer
Atomic No. is usually on the bottom, He(Helium) is 2, Atomic Mass is the number above rounded (not 100% sure about the rounded part), He (Helium) is 4, You find the neutrons by subtracting the atomic mass from the atomic number: He(Helium) is 4-2=2 so there are 2 neutrons.
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