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How many electrons can fill an f subshell?

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An f subshell can accommodate a maximum of 14 electrons.1

In the context of the periodic table and electronic configuration, subshells are designated by the orbital quantum number l. An f subshell corresponds to l = 3. Because there are $2 l + 1$ distinct orbitals for a given subshell, an f subshell contains seven orbitals. According to the Pauli exclusion principle, each individual orbital can hold a maximum of two electrons with opposite spins, resulting in a total capacity of 14 electrons for the f subshell.213