- The one with higher n.
- The one with lower n.
- The one with higher l.
- The one with lower l.

Category: Chemistry
- Atoms and molecules.
- Shells, subshells, and orbitals.
- Protons and neutrons.
- Solids, liquids, and gases.
- The (n?l) rule.
- The (n+l) rule.
- The spin rule.
- The ml? rule.
- A sphere.
- A dumbbell shape.
- A cloverleaf shape.
- A complex multi-lobed shape.
- A sphere.
- A dumbbell shape.
- A cloverleaf shape.
- A simple spherical shape.
- A dumbbell shape.
- A cloverleaf shape.
- A sphere.
- A complex multi-lobed shape.
- [Ar]4s23d1.
- [Ar]3d14s2.
- [Ar]4s13d2.
- 1s22s22p63s23p63d14s2.
- [Ne]3s23p4.
- [Ne]3s23p6.
- [Ar].
- Both B and C.
- Innermost orbitals.
- Outermost (valence) orbitals.
- p orbitals only.
- s orbitals only.
- n=4, l=1, m_l=0, m_s=+1/2.
- n=4, l=2, m_l=-1, m_s=+1/2.
- n=4, l=3, m_l=2, m_s=+1/2.
- n=3, l=2, m_l=0, m_s=-1/2.
- The maximum number of electrons in a subshell.
- The spin of an electron.
- The stability of multi-electron atoms.
- All of the above.
- Nuclear charge.
- Electron-electron repulsion.
- Proton-neutron interaction.
- Gravity.
- [Ar]4s23d9.
- [Ar]4s13d10.
- [Ar]3d104s1.
- [Ar]4s03d11.
- Aluminum.
- Phosphorus.
- Chlorine.
- Argon.
- All orbitals within a shell have the same size.
- s orbitals are always larger than p orbitals.
- Orbitals with higher n are generally larger.
- Orbital size depends only on atomic number.
- [Ar]4s23d8.
- [Ar]3d84s2.
- [Ar]4s13d9.
- [Ar]3d10.
- Particles only.
- Waves only.
- Both particles and waves.
- Neither particles nor waves.
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