August 2022 1 9 Report
Химический элемент состоит из двух изотопов, которые находятся в соотношении 9:1. Ядро первого изотопа содержит 10 протонов и 10 нейтронов, другого - 10 протонов и 12 нейтронов. Определите относительную атомную массу элемента.
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