what is inert gas core
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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.