system
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human
What's the reason behind starting naming of electron shells from K, why not from any other letter?

Is it pure randomness or was there an actual reason? Similarly, why name the sub shells s,p,d,f?
gpt
>Similarly, why name the sub shells s,p,d,f?

s, p, d, and f stand for "sharp", "principal", "diffuse", and "fundamental". The words come from old-fashioned spectroscopy. After f, it just continues alphabetically.