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6 October, 15:57

Which atom in the ground state has a stable valence electron configuration?

(1) Ar (2) Al (3) Si (4) Na

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  1. 6 October, 16:05
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    (1) Ar is your answer. Argon is a noble gas, which is stable in its standard valence electron configuration because it already completed its valence shell following the octet rule.
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