У каких металлов (или полуметаллов) есть аллотропия?
1) фосфор; 2) олово; 3) натрий; 4) мышьяк; 5) сурьма; 6) калий.

  1. 1, 4, 5
  2. 3, 6
  3. 2, 5
  4. 1, 3, 4, 6
30 / 50 (60%)
Question 30 of 50
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