Part A. Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n, ℓ, mℓ, ms).
Every electron in an atom is described by a unique set of four quantum numbers: n, ℓ, mℓ, and ms. The principal quantum number, nn, identifies the shell in which the electron is found. The angular momentum quantum number, ℓ, indicates the kind of subshell. The magnetic quantum number, mℓ , distinguishes the orbitals within a subshell. The spin quantum number, msm_s, specifies the electron spin.
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