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K-shell
[
key
-shel ]
SHOW IPA
/ ˈkeɪˌʃɛl /
PHONETIC RESPELLING
noun
Physics
.
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 of K-shell
First recorded in 1965–70