August 2022 0 12 Report
Из названия элементов HF, HCl, HBr, HI, H2S, H2SO4, H2SO3, HNO3, HNO2, HCO3, H2SIO3, H3PO4.

составить формулы: калий,цинк,галия, железа, 2х валентного железа, 3х валентного.
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