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What does electron configuration mean?

Looking for the meaning or definition of the word electron configuration? Here's what it means.

Noun
  1. (physics) The arrangement of electrons in an atom, molecule, or other physical structure like a crystal.
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At this point it should be noticed that the second noble gas, neon, has a closed-shell electron configuration, as does the first noble gas, helium.
The sodium ion has the same electron configuration as neon, the noble gas immediately before it on the Periodic Table.
Indeed, potassium is similar in chemical properties to sodium, which is consistent with its analogous electron configuration.
The chemical, metallurgical, and physical behaviours of the rare earths are governed by the electron configuration of these elements.

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