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K-shell

American  
[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.

Etymology

Origin of K-shell

First recorded in 1965–70

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.