October 2023 0 11 Report
Оксиген являє собою суміш ізотопів - нуклідів: ¹⁶O- 99,757 %, ¹⁷O- 0,039% i ¹⁸O- 0,204%. Обчисліть атомну масу Оксигену. Даю 50 балов​
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