How many electrons are in a filled f subshell?

A filled f subshell contains 14 electrons. This is because the f subshell can hold a maximum of 14 electrons distributed among its seven orbitals, with each orbital capable of accommodating two electrons. The electron configuration for the f block elements shows that there are four electrons available for each of the seven orbitals (2 electrons per orbital x 7 orbitals = 14 electrons total).

Understanding this concept is crucial when studying electron configurations, as it illustrates how electrons are organized in subshells and how their filling follows the Aufbau principle, Hund's rule, and the Pauli exclusion principle.