General chemistry 2 chapter 21 homework, Assignments of Chemistry

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• Chapter 21 Part

Chapter 21 Part 1 Interpreting the symbol for a nuclide oe QUESTION Fill in the information missing from this table. nuclide protons neutrons L A “ta | o }ajo oO Oo oO 40 90 o ist 12 o o The symbols that chemists write for nuclides tell you important information about them. For example, here is the symbol for a uranium-238 nuclide: mass 4 Po ose oan symbol atomic wan number You can solve this problem by using some important facts about nuclides: * The atomic number Z is equal to the number of protons. 238 For example, since Z = 92 for the “9,U nuclide, there must be 92 protons in its nucleus. * The mass number A is equal to the number of protons p/us the number of neutrons. For example, since A = 238 for the “jsU nuclide, there must be 146 neutrons in its nucleus, because 92+ 146 = 238. + The chemical symbol is determined by Z. For example, if Z= 92 for a nuclide, then its chemical symbol must be "U" for uranium, the 92nd element in the Periodic Table. nuclide protons neutrons zZ A "SLa 57 81 57 | 138 90. J 4o2t 40 50 40 90 23 i Na 11 12 ll 23