Azimuthal Quantum Number/Angular Quantum Number (ℓ)
Sub-shell or sub-level; Determines the shape
Magnetic Quantum Number (m or ml)
Orbitals; Determines the orientation
Spin Quantum Number (s or ms)
Direction of the spin or rotation of electron
Paramagnetic Elements
Elements that have unpaired electrons. They are attracted to external magnetic field.
Diamagnetic Elements
Elements that have completely paired electrons. They are weakly repelled by a magnetic field.
Ferromagnetic Elements
Fe, Co, Ni
Ferromagnetism arises when the unpaired electrons of the atoms or ions in a solid are influenced by the orientations of the electrons in neighboring atoms or ions.
Pauli’s Exclusion Principle
No two electrons can have the same set of 4 quantum numbers. Each atomic orbital can only accommodate 2 electrons.
Heisenberg’s Uncertainty Principle
It is impossible to determine simultaneously the electron momentum and position.