An atom of chlorine has 17 protons and 18 neutrons. Which of the following statements is true?
A. Chlorine has 35 electrons.
B. Chlorine has an atomic number of 18.
C. Chlorine atoms have 18 electrons.
D. Chlorine has a mass number of 35.
E. Chlorine has an atomic number of 35.
Answer: D
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