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23 July, 15:28

What subatomic particles make up an atom's mass number

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  1. 23 July, 17:06
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    Basically, together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
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