This is the absolute maximum number of electrons that can occupy any f subshell, regardless of whether it is the 4f subshell in Cerium or the 5f subshell in Uranium. This high capacity is what allows the f-block elements, the lanthanides and actinides, to span 14 columns in the periodic table.
Understanding f Subshell Quantum Rules and Electron Capacity
The azimuthal quantum number, denoted as l , determines the shape of the orbital and defines the subshell. This structural arrangement is consistent across all electron shells where the f subshell is present, whether in the 4f or 5f blocks of the periodic table.
Specifically, the values for mₗ are -3, -2, -1, 0, +1, +2, and +3. The spin quantum number, mₛ , can only have two values: +½ (spin up) or -½ (spin down).
Understanding the Quantum Rules Behind f Subshell Electron Capacity
The f subshell is the third in the hierarchy of subshells, following s and p, and appears beginning in the fourth principal energy level. For an f subshell, the value of l is 3.
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