Chemistry
Chemistry, 16.10.2020 09:01, evelyng58

18. Which of these is an ion? A. Fluorine with 9 protons
B. Calcium with 18 electrons
C. Calcium with 18 neutrons
D. Fluorine with 9 neutrons

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18. Which of these is an ion? A. Fluorine with 9 protons
B. Calcium with 18 electrons
C...

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