Why the electron shells are called KLM not ABC?

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 Why the electron shells are called KLM not ABC?

Orbital: px, py, pz - 2 electrons each
Subshell: s1, p3, d5, f7
Shell: K s, L sp, M spd, N spdf 


Here is a nice article explaining this.
General Chemistry Online: FAQ: Electrons in atoms: Why are the shells named K, L, M, ... instead of A, B, C...?












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