Укажите аллотропные модификации кислорода.
1) O₂; 2) ¹⁶O; 3) O₃; 4) O²⁻.

  1. 1 и 3
  2. 1, 2, 3
  3. 2 и 3
  4. все
3 / 50 (6%)
Question 3 of 50
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