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Practice Problems – Answer Key Describe how Thomson and Rutherford each contributed to the modern understanding of atomic structure. Explain the experiments and results in your own words How many neutrons are there in a P-33 atom? _18___ How many protons are there in an Fe 3+ ion? ___26__ All chromium particles must have the same number of (p, n or e?)__P__ What particle has a +2 charge and 12 protons? Write it in isotopic notation.   Mg 12 24 2+ What particle has 30 protons and 28 electrons? Write it in isotopic notation.   Zn 30 65 2+ What particle has 47 protons and a +1 charge? Write it in isotopic notation. Ag 47 108 1+ Element/Ion Atomic Number Number of Protons Number of Neutrons Number of Electrons Mass Number 1 1 0 1 1 1 1 0 0 1 6 6 6 6 12 3 3 4 3 7 17 17 18 18 35 19 19 20 19 39 12 12 12 10 24 33 33 42 33 75 47 47 61 46 108 16 16 16 18 32

Uranium has three common isotopes. If the abundance of 234 U is 0.01%, the abundance of 235 U is 0.71%, and the abundance of 238 U is 99.28%, what is the average atomic mass of uranium? (0.0001)(234) + (0.0071)(235) + (.9928)(238) = 237.978 amu (technically limited to 1 sig. fig. due to the 0.01% value. Classify each of the following as alkali meal, alkaline earth metal, halogen, or noble gas: Sodium - alkaline metal Iodine - halogen Calcium – alkaline earth metal Barium – alkaline earth metal Krypton – noble gas Write the symbol for the following and identify them as either metal, nonmetal, or metalloid: Lead - metal Potassium - metal Arsenic – metalloid Xenon - nonmetal How many moles of copper are there in a 35.8g sample? How many atoms? 0.563 mol; 3.39x10 23 atoms