- 1s < 2s < 2p < 3s < 3p < 4s < 3d.
- 1s < 2s = 2p < 3s = 3p = 3d.
- 1s = 2s = 2p.
- 1s < 3d < 4s.
No category found.
- 1s < 2s < 2p < 3s < 3p < 3d.
- 1s < 2s = 2p < 3s = 3p = 3d.
- 1s < 2p < 2s.
- 1s = 2s = 2p.
- dz2?.
- dx2?y2?.
- dxy?.
- dyz?.
- dz2?.
- dx2?y2?.
- dxy?.
- dxz?.
- Parallel.
- Along x, y, and z axes, mutually perpendicular.
- Randomly.
- Along the diagonal.
- n=2, l=1, m_l=0, m_s=+1/2.
- n=3, l=2, m_l=-1, m_s=-1/2.
- n=1, l=1, m_l=0, m_s=+1/2.
- n=4, l=0, m_l=0, m_s=-1/2.
- n=1, l=0, m_l=0, m_s=+1/2.
- n=1, l=1, m_l=0, m_s=+1/2.
- n=0, l=0, m_l=0, m_s=+1/2.
- n=1, l=0, m_l=1, m_s=+1/2.
- Any electron in an atom.
- Electrons in the innermost shell.
- Electrons in the outermost principal energy level.
- Electrons in a d orbital.
- 1s22s22p6.
- (??) (??) (?)(?)(?).
- [He]2s1.
- 2p.
- [Ne]3s23p5.
- [Ar]3s23p5.
- 1s22s22p63s23p4.
- [Ne]3s23d5.
