Noble Gas Core Definition

The outer electron shell is filled for a noble gas atom.
The outer electron shell is filled for a noble gas atom. pslawinski, wikipedia.org

Definition: A noble gas core is an abbreviation in an atom's electron configuration where the previous noble gas's electron configuration is replaced with the noble gas's element symbol in brackets.

Examples: Sodium has an electron configuration of 1s22s2p63s1.

The previous noble gas on the periodic table is neon with an electron configuration of 1s22s2p6. If this configuration is replaced by [Ne] in sodium's electron configuration it becomes [Ne]3s1.

This is the noble gas core notation of sodium.

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Helmenstine, Anne Marie, Ph.D. "Noble Gas Core Definition." ThoughtCo, Jun. 10, 2015, thoughtco.com/definition-of-noble-gas-core-605411. Helmenstine, Anne Marie, Ph.D. (2015, June 10). Noble Gas Core Definition. Retrieved from https://www.thoughtco.com/definition-of-noble-gas-core-605411 Helmenstine, Anne Marie, Ph.D. "Noble Gas Core Definition." ThoughtCo. https://www.thoughtco.com/definition-of-noble-gas-core-605411 (accessed January 17, 2018).