Usually means: Defines electron's energy and shell.
Definitions Related words Mentions
We found 9 dictionaries that define the word principal quantum number:

General (5 matching dictionaries)
  1. principal quantum number: Merriam-Webster
  2. principal quantum number: Wiktionary
  3. principal quantum number: Infoplease Dictionary
  4. principal quantum number: Dictionary.com
  5. Principal quantum number: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. principal quantum number: Encyclopedia

Science (3 matching dictionaries)
  1. Principal Quantum Number: Eric Weisstein's World of Physics
  2. Principal Quantum Number: Extragalactic Astronomy
  3. principal quantum number: UNCChem Glossary

Definitions from Wiktionary (principal quantum number)

noun:  (physics) The quantum number (of an atomic orbital) that specifies the energy of an electron in an atom and, hence, which shell it occupies

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