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Biology, 10.11.2019 03:31 shawn20034

Oxygen has an atomic number of 8. the n = 1 energy level has two electrons, and the n = 2 energy level has six electrons. oxygen's valence is

+2,-2,+1,-1

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Oxygen has an atomic number of 8. the n = 1 energy level has two electrons, and the n = 2 energy lev...
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