
Suppose an atom has a mass number of 23. Which statement is true beyond any doubt?
A. The atom has an odd number of neutrons.
B. The atomic number is less than 11.
C. The atom is not an ...
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... isotope.
D. The number of protons in the nucleus does not equal the number of neutrons.

D. The number of protons in the nucleus does not equal the number of neutrons.
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