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An atom is chemically stable if its outer energy level (is filled with, contains no) electrons.
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An atom is chemically stable if its outer energy level (is filled with, contains no) electrons.

User Johanneslink
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Well, according to the octet rule, an atom is chemically stable when the outer energy level is filled with 8 electrons. Similar is the case with noble gases. They contain 8 electrons in the outermost shell and thus they are stable.
User Kroltan
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