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Unformatted text preview: What makes isotopes of an element different from one another? Isotopes are atoms of an element with the same number of protons, but different number of neutrons. The atomic mass of two isotopes of the same element will be different. 6. What are ions? How does an atom become an ion? Ions are charged atoms or groups of atoms. An atom becomes an ion by gaining or losing electrons. 7. What ions are formed when the following ionic compounds dissolve in water? a. BaCl 2 b. Co 2 (SO 3 ) 3 c. AgNO 3 d. Fe(NO 2 ) 2 Ba 2+ and 2Cl-2Co 3+ and 3SO 3-2 Ag + and NO 3-Fe 2+ and 2NO 2- 8. Verify that the average atom mass of rubidium, (Rb), by using the information below: Rb-85 (72.17%) Rb-87 (27.84%) 85 amu (0.7217) + 87 amu (0.2784) = 85.56 amu...
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