Выберите элементы с переменной валентностью.
1) магний; 2) хлор; 3) железо; 4) калий; 5) азот; 6) фтор.

  1. 1, 3, 5
  2. 2, 4, 6
  3. 1, 2, 5
  4. 2, 3, 5
37 / 50 (74%)
Question 37 of 50
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