最終更新日：2024/07/28
The mass number of an atom is the total number of protons and neutrons in its nucleus.
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The mass number of an atom is the total number of protons and neutrons in its nucleus.
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The mass number of an atom is the total number of protons and neutrons in its nucleus.
The mass number of an atom is the total number of protons and neutrons in its nucleus.
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