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Just wanted to share a clarification on something I used to mix up all the time. Shells refer to the principal quantum number (n); subshells refer to the angular momentum quantum number (l); and orbitals refer to the magnetic quantum number/subshell orientation (ml). When something is referred to as a s-orbital or p-orbital, that refers to the orientation of the s or p subshell. I used to think that s, p, f, d, etc. were actually the orbitals because they were referred to that way, but I realized that they are actually subshells! Hope others weren't confused by this because it threw me for a loop at first!
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