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M-shell

[ em-shel ]
/ ˈɛmˌʃɛl /
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noun Physics.
the third shell of electrons surrounding the nucleus of an atom and containing, when filled, 18 electrons having principal quantum number three.
QUIZ
SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
Should you take this quiz on “shall” versus “should”? It should prove to be a quick challenge!
Question 1 of 6
Which form is used to state an obligation or duty someone has?
Compare K-shell, L-shell, N-shell.

Origin of M-shell

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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