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Chem 110 Recitation Problems – Chapter 1 1 1. The two naturally occurring isotopes of rubidium (Rb) are rubidium-85, with an atomic mass of 84.91179 amu; and rubidium-87, with an atomic mass of 86.90919 amu. The average atomic mass for rubidium is 85.4678 amu. What are the percent natural abundances of these isotopes? 72.1633% Rb-85 and 27.8367% Rb-87 2. Determine the number of protons, electrons, and neutrons in the following. Protons Electrons Neutrons 208 Pb 2+ 82 80 126 37 Cl 17 18 20 23 Na 11 11 12 N-14 7 7 7 3. Thompson’s work with cathode ray tubes lead to the discovery that which of the
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Unformatted text preview: following parts of Dalton’s Atomic Theory were incorrect. A. Atoms are made up of tiny indestructible particles B. Atoms combine in small whole number ratios to form compounds C. Chemical reactions are the rearrangement of atoms. D. Elements are made up of atoms of the same mass 4. Classify each of the following as metal, non-metal, or metalloid. In Metal Ge Metalliod P Non-metal 5. Which of the following is a halogen? A. Ar B. Cl C. Mg D. Mn E. Na 6. Calculate how many atoms of F are in 0.125 g of SF 6 . 3.09x10 21...
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