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M-shell

[em-shel] /ˈɛmˌʃɛl/
noun, Physics.
1.
the third shell of electrons surrounding the nucleus of an atom and containing, when filled, 18 electrons having principal quantum number three.
Compare K-shell, L-shell, N-shell.
Origin
1920-1925
1920-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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