11. Highest lonization Energy in Carbon group: C, Si, Pb 12. Largest atomic size in Period 5: Ag, I, Xe 13. Highest Electronegativity in Boron group: In, Ga, Al 14. Circle the element with the lowest lonization Energy in Period 4: K, Ga, Kr 15. Lowest Electronegativity in Group II: Be, Ba, Ca