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valence is the number of electrons an atom must gain or lose in order to _____ its outer shell or have a stable octet in its outer shell.

User Filaton
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Answer:

complete

Step-by-step explanation:

an valence can't be completed unless the outer shell is closed and stable

User Graphitemaster
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Valence is the number of electrons an atom must gain or lose in order to complete its outer shell or have a stable octet in its outer shell.
User Nandi
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