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Meaning of K-shell

K-shell

Pronunciation: (kā'shel"), [key]
— n. Physics.
  1. the first shell of electrons surrounding the nucleus of an atom and containing, when filled, two electrons having principal quantum number 1. Cf. L-shell, M-shell, N-shell.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.