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Q. Which of the following is the maximum number of electrons that can be present in M-shell?
Answer: 18
Notes: The maximum number of electrons that can occupy a specific energy level can be found using the following formula: Electron Capacity = 2n2. The variable n represents the Principal Quantum Number, the number of the energy level in question. Since the M-shell belongs to 3rd energy level, its electron capacity = 2 × 32 = 18
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