Both 18O and 16O are found in nature. However, 16O is the most common. Therefore,
A. these are different elements.
B. only the common form of 16O can bond with hydrogen atoms to form H2O.
C. oxygen atoms can have eight or 10 neutrons.
D. 18O has two additional electrons in its outer shell.
E. 18O is the form of oxygen that provides living cells with life.
Answer: C
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