В каких элементах НЕ встречается аллотропия?
1) азот; 2) углерод; 3) бор; 4) фосфор; 5) кислород; 6) хлор; 7) железо; 8) олово; 9) кремний; 10) водород.

  1. 2, 4, 5, 8
  2. 2, 5, 7
  3. 2, 4, 8, 10
  4. 1, 3, 6, 9
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