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How many electrons can fill a p subshell?

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A p subshell can hold a maximum of 6 electrons.1

This capacity is determined by the quantum numbers associated with the subshell. For a p subshell, the orbital quantum number is $l = 1$ . According to the rules of atomic physics, there are $2 l + 1$ distinct orbitals for a given subshell, which in this case results in three separate orbitals ( $2 (1) + 1 = 3$ ). Because the Pauli exclusion principle dictates that each individual orbital can accommodate a maximum of two electrons with opposing spins, the three p orbitals together can hold a total of 6 electrons.1