Biology, 24.10.2019 08:43 emilyharper

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...