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MDCAT · Chemistry · Parcha original · Sample

The maximum number of electrons that the third shell (n = 3) can hold is:

  1. A. 8
  2. B. 18✓ Correct answer
  3. C. 32
  4. D. 9

Explanation

A shell can hold at most 2n² electrons. For n = 3 that is 2 × 3² = 18 (3s² 3p⁶ 3d¹⁰).

کوئی شیل زیادہ سے زیادہ 2n² الیکٹران رکھ سکتا ہے۔ n = 3 کے لیے 2 × 3² = 18 (3s² 3p⁶ 3d¹⁰)۔