Определите число d-электронов у иода в состоянии валентности III.

  1. 18
  2. 20
  3. 24
  4. 21

📝 Detailed explanation

I (Z=53): 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁵. В возбуждённом состоянии (III): …4d¹⁰5s²5p³5d². d-электроны: 10 + 10 = 20.
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