slavamelkym slavamelkym
  • 09-12-2022
  • Chemistry
contestada

1. Елемент, вищий оксид якого має формулу E2O7, утворює з Гідрогеном газоподібну сполуку, масова частка Гідрогену в якій становить 2,74%. Визначте, що це за елемент, у відповіді вкажіть його протонне число. ​

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