Jisho

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Noun
1. electron shellPhysics
Wikipedia definition
2. Electron shellAn electron shell may be thought of as an orbit followed by electrons around an atom's nucleus. The closest shell to the nucleus is called the "1 shell" (also called "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on further and further from the nucleus. The shell letters K, L, M, ... are alphabetical.
Read “Electron shell” on English Wikipedia
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Read “Electron shell” on DBpedia

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