Какие элементы имеют аллотропию?
1) ртуть; 2) кальций; 3) бром; 4) железо; 5) олово.

  1. 1, 2
  2. 4, 5
  3. 2, 3, 4
  4. 2, 3
18 / 50 (36%)
Question 18 of 50
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