What is the maximum number of electrons that the third orbit or M-shell can have?

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SSC CHSL Tier-I Exam 2022 Official Paper (Held On: 21 March, 2023 Shift 2)
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  1. 32
  2. 8
  3. 18
  4. 2

Answer (Detailed Solution Below)

Option 3 : 18
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SSC CHSL Exam 2023 Tier-I Official Paper (Held On: 02 Aug 2023 Shift 1)
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Detailed Solution

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The correct answer is 18.

Key Points

  • The maximum number of electrons that can be accommodated in the M shell of an atom is 18.
    • The shell corresponds to the principal quantum numbers.
    • For the M shell principle, the quantum number is 3.
    • So, the maximum number of electrons present in the M shell is 18.
    • The shell number is expressed by the formula 2n2, where n is the number of shells.
    • The shells, values of n, and the total number of electrons can be accommodated.

Additional Information

  • Each subshell is constrained to hold 4ℓ + 2 electrons at most, namely:
    • Each s subshell holds at most 2 electrons
    • Each p subshell holds at most 6 electrons
    • Each d subshell holds at most 10 electrons
    • Each f subshell holds at most 14 electrons
    • Each g subshell holds at most 18 electrons
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