UNIT 1 2. Which atom has six valence electrons? a. lithium d. neon b. carbon e. boron c. sulfur 3. Which atom has a nucleus that contains 20 protons? a. lithium d. calcium b. krypton e. potassium c. carbon 5. Which of the following atoms has the largest radius? a. lithium b. lead c. cesium d. fluorine e. carbon 6. Which of the following atoms has the highest first ionization energy? a. helium b.xenon c. potassium d. hydrogen e. carbon

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