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Subshells are groups of orbitals within an electron shell of an atom. Each subshell is characterized by a unique value of the angular momentum quantum number, (l). The (l) values range from (0) to (n-1), where (n) is the principal quantum number of the shell. The subshells are commonly denoted by the letters (s), (p), (d), (f), and (g), corresponding to (l) values of (0), (1), (2), (3), and (4), respectively.