Oxygen has an atomic number of 8. This means that oxygen has ____
a. 8 electrons in its outer most shell
b. 8 neutrons in its nucleus
c. 4 protons and 4 neutrons in its nucleus
d. 8 protons in its nucleus
e. 8 protons and 8 neutrons in its nucleus
ANSWER: d
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Fill in the blank(s) with correct word