Укажите верное утверждение.

  1. Mr(H₂) = 2 г/моль
  2. mₐ(Na) = 23
  3. Ar(O) = 16 а.е.м.
  4. mₐ(F) = 19/Nₐ
37 / 76 (49%)
Question 37 of 76
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