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Which of the following statements is TRUE? (a) The atomic number is the same as the mass number. (b) The atomic number is the same as the number of protons. (c) The identity of a chemical element is determined by the number of valence electrons. (d) The radius of all atoms can be measured precisely. (e) Different isotopes of an element have different atomic numbers.

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Deanna Hettinger
Deanna HettingerLv2
28 Jun 2018
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