December 2021 1 3 Report
1) Э+4HNO3+6HF-----t---> H2ЭF6+4NO2(газ)+4H2O Это может быть Al?))
 Поставить за место буквы "Э" элемент с названием из 8 букв из 5 первых периодов.. Halp me!!!

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