Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Unit 2: Atoms and Elements AP Chemistry Isotopes Problem Set 21. Give the mass number of each of the following atoms: (a) an iron atom with 30 neutrons 56 (b) an americium atom with 148 neutrons 243 (c) a tungsten atom with 110 neutrons 184 23. Give the complete symbol ( AZ X ) for each of the following atoms: 15 (a) nitrogen with 8 neutrons 7N 64 (b) zinc with 34 neutrons 30Zn 129 (c) xenon with 75 neutrons 54Xe 25. How many electrons, protons, and neutrons are there in an atom of: (a) carbon-13, 13 C p+ = 6 n0 = 7 e- = 6 27. (b) copper-63, 63 Cu p+ = 29 n0 = 34 (c) bismuth-205, 205 Bi p+ = 83 n0 = 122 31. 33. e- = 83 Fill in the blanks in the table (one column per element). 65 86 Symbol Cu Kr Number of protons Number of neutrons Number of electrons in the neutral atom Name of element 29. e- = 29 195 78Pt 82 36Kr 29 36 36 50 78 117 36 46 29 36 78 36 Copper Krypton Platinum Krypton Radioactive americium-241 is used in household smoke detectors and in bone mineral analysis. Give the number of electrons, protons, and neutrons in an atom of americium-241. p+ = 95 n0 = 146 e- = 95 Which of the following are isotopes of element X, with atomic number of 9: 199 X , 209 X , 189 X , and 219 X . Verify that the atomic mass of magnesium is 24.31 amu, given the following information: 24 Mg , mass = 23.985042 amu; percent abundance = 78.99% 25 Mg , mass = 24.985837 amu; percent abundance = 10.00% 26 Mg , mass = 25.982593 amu; percent abundance = 11.01% 35. Copper has two stable isotopes, 63 Cu and 65 Cu , with masses of 62.939598 amu and 64.927793 amu, respectively. Calculate the percent abundances of these isotopes of copper. 63 65 Cu = 69.50% Cu = 30.50 % 37. Strontium has four stable isotopes, Strontium-84 has a very low natural abundance, but 88 86 Sr are all reasonably abundant. Which of these more abundant isotopes predominates? Sr , 87 Sr , and