Which quantum numbers are required to define an orbital?

  • A
    $n, l$
  • B
    $n, l, s$
  • C
    $n, l, m$
  • D
    $l, m, s$

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In a potassium atom,the electronic energy levels are in the following order:

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The maximum number of permissible rotational orientations of the $2s$ electron of lithium atom in ground state is

Which set of quantum numbers is correct for the valence electron of $Na$?

For $d$ electrons,the azimuthal quantum number is

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