October 2021 0 17 Report
Определите число протонов (p), электронов (e) и нейтронов (n) в атоме бария: 1 p=81, e=81, n=137
2 p=137, e=137, n=81
3 p=56, e=137, n=56
4 p=56, e=56, n=81
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