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A proton is a positively charged particle which is generally considered to be a composite particle comprising of three quarks interacting through the strong force (e.g. in the standard model.)

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Can mass number of nucleus be equal to it's atomic number? [closed]

And also number of protons are actually the atomic number of the elements. So I know that, why mass number is greater than atomic number. … This means number of protons is equal to mass number i.e. number of neutrons is zero. And if there are no neutrons then how can it be called as nucleus? Is the given answer is wrong? …
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