Какие элементы имеют аллотропию?
1) кислород; 2) водород; 3) фтор; 4) азот; 5) углерод.

  1. 1, 2
  2. 1, 5
  3. 2, 3, 4
  4. 2, 3
17 / 50 (34%)
Question 17 of 50
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