15. Explain the following trends: (i) (ii) toiwo loke Why does fluorine have a smaller atomic radius than beryllium? essa sniwollat pd to doesnt ES Why does fluorine have a smaller atomic radius than chlorine? de can Sain 177 hotmonta 16. How is an element's outer electron configuration related to its position in the periodic table? 17. Arrange these elements in order of decreasing atomic size: sulfur, chlorine, aluminum, and sodium. Does your arrangement demonstrate a periodic trend or a group trend? 18. Circle the element in each of the following pairs has the greatest atomic radius. a. sodium & lithium b. strontium & magnesium c. carbon & fluorine 19. Define 1st ionization energy - 20. Metals typically form bingens o a. lithium & boron d. calcium & selenium c. sulfur & aluminum 21. Circle the element in each of the following pairs has the greatest ionization energy. b. cesium & potassium ions by losing their outer electrons. d. chlorine & iodine 3

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