1. 
   subshell
   sublevel. A set of electrons with the same azimuthal quantum number. The number of electrons permitted in a subshell is equal to 2 + 1.
   Found op http://antoine.frostburg.edu/chem/senese/101/glossary/s.shtml
   
   
2. 
   subshell
   (from the article `spectroscopy`) ...called the orbital quantum number, must be less than the principal quantum number , which corresponds to a `shell` of electrons. Thus, divides ... ...in a shell of principal quantum number are limited to the values 0, 1, 2, . . . , 1, and the value of of an orbit...
   Found op http://www.britannica.com/eb/a-z/s/178
   
   
3. 
   subshell
   A set of electrons with the same angular momentum quantum number (l). The number of electrons permitted in a subshell is equal to 2l + 1. Related entry • shell
   Found op http://www.daviddarling.info/encyclopedia/S/subshell.html
   
   
4. 
   Subshell
   A set of electron orbitals with the same principal and second quantum numbers.
   Found op http://www.chemistry-dictionary.com/definition/subshell.php
   
   

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