For the energy levels in an atom, which one of the following statements is correct

Options :
  1. there are seven principal electron energy levels
  2. the second principal energy level can have four sub energy levels and contains a maximum of eight electrons
  3. the M energy level can have maximum of 32 electrons
  4. the 4s sub energy level is at a higher energy than the 3d sub energy level


Answer and Explanation :-

Answer: Option 2

Explanation:

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