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Name Date Section 3.1 What are elements? Main Idea Electrons in Energy Levels Use with page 56. Details Draw the figures below to help you understand isotopes and energy levels in atoms. Use Figure 3-2 and information from your book to help you. 1. Draw a chlorine-35 atom. 2. Label the nucleus with the number of protons and neutrons inside. 3. Circle the valence energy level. eâ eâ Isotopes Use with page 57. eâ eâ eâ eâ 17 protons 18 neutrons eâ eâ eâ eâ eâ eâ eâ eâ eâ eâ eâ 1. Draw a chlorine-37 atom. 2. Label the nucleus with the number of protons and neutrons inside. 3. Circle the valence energy level. eâ eâ eâ eâ eâ eâ eâ 17 protons 20 neutrons eâ eâ eâ eâ eâ eâ eâ eâ eâ eâ eâ Name the relationship of the two atoms you drew above. State if the two atoms would have the same properties, or not. What elements are most abundant? Use with page 58. Analyze the circle graphs in Figure 3-4 in your text. Write the chemical symbols for elements that match the following descriptions. the 3 most common elements in Earthâs crust the most abundant element in the universe the element that makes up 5.0% of Earthâs crust 4 elements that are common both in the universe and in the earthâs crust S YNTHESIZE Make a concept map to organize facts you have learned in this section about elements. 28 Section 3.1 What are elements?