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The '''principal quantum number''' is the [[quantum number]] that determines the size and (in [[hydrogen]] [[atom]]s) the energy of an orbital. ''n'' is used to label [[electron shell]]s. ''n'' can be any [[integer]] value from 1 to infinity. <ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref>
The '''principal quantum number''' is the [[quantum number]] that determines the size and (in [[hydrogen]] [[atom]]s) the energy of an orbital. ''n'' is used to label [[electron shell]]s. ''n'' can be any [[integer]] value from 1 to infinity.<ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref>
==References==
==References==