For the $H$ atom,which of the following is the correct order of energy?

  • A
    $3s = 3p = 3d = 4s = 4p = 4d = 4f$
  • B
    $3s = 3p = 3d < 4s = 4p = 4d = 4f$
  • C
    $3s = 3p = 3d = 4s < 4p < 4d < 4f$
  • D
    $3s < 3p < 4s < 3d < 4p < 4d$

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