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Whats the answer and how you got it please :-)

Whats the answer and how you got it please :-)-example-1
User Ssk
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1 Answer

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For the element chlorine to be "happy", it needs 8 valence electrons meaning it needs 8 electrons on its outer shell. So the answer would be chlorine because it has 7 valence electrons in the picture and it needs one more to be considered stable.
User Alialtansaka
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