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  • Brainly User
2016-03-01T20:43:51+05:30

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FLUORINE Atomic number 9

And next two are OXYGEN and  NITROGEN 

You can remember it by FON 
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2016-03-01T21:42:59+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Fluorine
atomic number 9
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