The electron shell in an atom corresponding to a principal quantum number of four. The shell contains up to 32 electrons and is the last shell to be filled completely by electrons in the naturally occuring elements. See panel on Atomic structure,
What is N-SHELL?
Edited and fact checked by Pam: Google +
The Science Dictionary is the most comprehensive source of science definitions online with over 38K science terms written and created by our global team of scientists and academic professionals. ...more