1.

What is the maximum number of electrons in the M-Shell ?1. 62. 83. 184. 32

Answer» Correct Answer - Option 3 : 18

  • Concept:
    • The distribution of electrons into different orbits of an atom was suggested by Bohr and Bury. The orbits or shells are represented by the letters K, L, M, N,… or the numbers, n = 1, 2, 3, 4.
    • The following rules are followed for writing the number of electrons in different energy levels or shells:
    • The maximum number of electrons present in a shell is given by the formula 2n2, where ‘n’ is the orbit number or energy level index. 
  • Calculation:
    • Given:
    • Shell given = M, orbit number = 3.
    • The maximum number of electrons present in a shell is given by the formula 2n2.
    • Therefore, 2 × 32 = 18


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