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参考・概略です

●(2)質量数=左上の数

●(1)原子番号=(3)陽子数=(5)電子数

●(4)中性子数=(2)質量数-(3)陽子数

以上から

 ¹²C 6,12,6,6,6

 ¹³C 6,13,6,7,6

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