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Chemistry, 20.11.2020 18:50 sl3olsonow8388

Deandra notices that most of the atomic masses on the periodic table are not whole numbers. She wonders: "Why do many atomic masses have decimals?"
Which of the following would be the best answer to her question?
A the atomic mass includes the mass of the electrons
B. the atomic mass measures the relative abundance of the ions
C. the mass of neutrons can vary
D. the atomic mass is a weighted average of the isotopes

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