In a neutral atom, protons equal electrons, so there are 31 protons. Subtracting 31 protons from the mass number 70 gives 39 neutrons present in the nucleus of atom X.
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In a neutral atom, protons equal electrons, so there are 31 protons. Subtracting 31 protons from the mass number 70 gives 39 neutrons present in the nucleus of atom X.