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M-shell

[em-shel]

M-shell

[em-shel]
noun Physics.
the third shell of electrons surrounding the nucleus of an atom and containing, when filled, 18 electrons having principal quantum number three.


Origin:
1920–25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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M-shell is always a great word to know.
So is spectrum. Does it mean:
a photon of penetrating electromagnetic radiation emitted from an atomic nucleus; electromagnetic radiation with wavelengths shorter than 1/10 of a nanometer
light waves or particles, the band of colors produced when sunlight passes through a prism, comprising red, orange, yellow, green, blue, indigo, and violet
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