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amelinanastyla
@amelinanastyla
September 2021
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число протонов и нейтронов в ядрах атомов химических элементов с номерами 13 и 53
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nikolaygr
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№13 протонов=13 нейтронов 14
№53 протонов=53 нейтронов=74
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№13 протонов=13 нейтронов 14№53 протонов=53 нейтронов=74