August 2021 0 11 Report
Порядковыми номерами химических элементов А, Б и В являются соответственно n, n + 2, n + 4.Может могут А, Б и В обычных условиях быть газами (как простые вещества)? Заранее спасибо, Будешь самым лучшим
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