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The periodic table shows O as 15.999 amu but 160 has mass 15.99492 amu. Why the difference? (Answer in 15 words or less. Hint:

The periodic table shows O as 15.999 amu but 160 has mass 15.99492 amu. Why the difference? (Answer in 15 words or less. Hint: Answer is not sig figs or rounding.)

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