1. Determine the number of protons, neutrons and electrons F-20 , a radioactive isotope of fluorine. 2. Rank the sub-atomic particles from least to greatest mass 3. which description most accurately describes neptium -239? a. mass number=93, atomic number=239 b. mass number =93, number of neutrons=146 c. mass number=146, atomic number=93 d. number of protons=93, number of neutrons= 146

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