[ em-shel ]
/ ˈɛmˌʃɛl /
the third shell of electrons surrounding the nucleus of an atom and containing, when filled, 18 electrons having principal quantum number three.
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Origin of M-shell
First recorded in 1920–25
Words nearby M-shell
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020