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K-shell

[key-shel] /ˈkeɪˌʃɛl/
noun, Physics.
1.
the first shell of electrons surrounding the nucleus of an atom and containing, when filled, two electrons having principal quantum number 1.
Compare L-shell, M-shell, N-shell.
Origin
1965-1970
1965-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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