Problem: The atomic number of oxygen is 8, because oxygen has a. a second shell with eight electrons. b. electrons in eight shells. c. eight protons in the nucleus. c. an atomic mass of 8.

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The atomic number of oxygen is 8, because oxygen has 

a. a second shell with eight electrons. 

b. electrons in eight shells. 

c. eight protons in the nucleus. 

c. an atomic mass of 8.

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