I might as well be trying to read Greek, but I think this is a reasonable merge attempt from Subshell. Feel free to revise/revert as needed
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An '''electron subshell''' is a division of a larger [[electron shell]] based on energy levels. Energy subshells identified by the angular momentum [[quantum number]], <math>l</math>. They can also be described using spectroscopic notation:
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An '''electron subshell''' is a division of a larger [[electron shell]] with the same azimuthal [[quantum number]] based on energy levels. The number of electrons permitted in a subshell is equal to 2''l'' + 1.<ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref> Energy subshells identified by the angular momentum [[quantum number]], <math>l</math>. They can also be described using spectroscopic notation: