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Sagot :
Answer:
It's been a long while since I've done this but
Explanation:
I think the answer is D. They both have valence electrons in the first main energy level Carbon atoms are made up of 6 protons, 6 electrons, and 6 neutrons, whereas Oxygen atoms are made of 8 protons, 8 neutrons, and 8 electrons.
I might be very wrong..
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