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18 September, 13:39

Atoms have how many protons and neutrons?

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  1. 18 September, 14:30
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    The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. For hydrogen, the atomic number is 1 because there is one proton and no neutrons. For helium, it is 4: two protons and two neutrons.
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