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DeltaTango
5 electrons because first shell can only have two electrons and second can hold up until 8
emogalaxcy
if it had seven electrons then we know that the first energy lever has to have two and no more and so it would be 5 as you will only have 5 left. if you had more then 8 then there would be three but these not so your fine!! 5 electrons on other shell

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