最終更新日：2024/08/03
The nucleon number of an atom is equal to the sum of its protons and neutrons.
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The nucleon number of an atom is equal to the sum of its protons and neutrons.
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The nucleon number of an atom is equal to the sum of its protons and neutrons.
The nucleon number of an atom is equal to the sum of its protons and neutrons.
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