dawach2006 dawach2006

19-12-2022
Chemistry

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Елемент Е має умовну формулу його леткої сполуки з Гідрогеном RH3 та утворює вищій оксид, в якому масова частка елемента дорівнює 43, 67%. Визначити елемент. В відповіді вказати його порядковий номер.

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