How many electrons can the M shell () hold at most?

Answer and explanation

Correct answer: C. 18

  1. Step 1: The maximum electron capacity of an electron shell with principal quantum number is given by the Bohr-Bury formula .
  2. Step 2: For the M shell, the principal quantum number is .
  3. Step 3: Substitute : electrons.
Answer
18.
Why not the others: 2 is the maximum capacity of the K shell (); 8 is the capacity of the L shell (); 32 is the capacity of the N shell ().

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