По данным таблицы найдите Ar элемента X. Ион X³⁺: N(ē)=21, N(p)=a, N(n)=a+4.

  1. 52
  2. 51
  3. 55
  4. 56

📝 Detailed explanation

В X³⁺ электронов 21 → атом имеет 24 ē → Z = 24 (Cr). n = 24 + 4 = 28. A = 24 + 28 = 52.
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Question 36 of 71
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