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Biology, 11.01.2020 02:31 Chartwig4831

Fluorine has an atomic number of 9. the n = 1 energy level has two electrons, and the n = 2 energy level has seven electrons. flourine's valence is

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Fluorine has an atomic number of 9. the n = 1 energy level has two electrons, and the n = 2 energy l...
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