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The rule is that all of the orbitals (respectively - all of shells and blocks) of the element must be filled with their maximum number of electrons.Such phenomenon is observed in the noble gases (group VIII A) - their last blocks - s and p are filled with the total number of 8 electron (2 for s and 6 for p).

For instance - The Argon (Ar) has 18 electrons and its configuration is:

1s22s22p63s23p6

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Q: What is the electron configuration for a element that's not chemically reactive?
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