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Biology, 23.07.2019 19:30 promcafee8788
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
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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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