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Transcript
Leader: Sara Course: Chem177 Instructor: Kingston Supplemental Instruction Date: Monday, November 3 Iowa State University 1) Effective Nuclear Charge: the net positive charge experienced by an electron in a many-electron atom. What is the equation? Zeff = Z – S Z = atoms number (# of protons or electrons) S = Shielding/Screening electrons Same n: 0.35 n-1: 0.85 n-2,3+: 1 Worksheet 7B: Periodic Table Trends 2) Write the electron configuration for the following, also include the calculated Zeff. a. Bromine 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 34-10-(18*.85)-(6*.35)= b. Sulfur 1s2 2s2 2p6 3s2 3p4 16-2-(8*.85)-(5*.35)= 3) What atom has the LARGEST atomic radius? Francium 4) What atom has the SMALLEST atomic radius? Helium 5) Which of the following molecules would you expect to be Largest? a. Br2 Cl2 Br2 b. NaCl KCl KBr NaBr KBr 6) If the charge of an atom changes, does the radius of the atom change? Yes Cations are smaller, anions are larger 7) Which is larger? a. Mg or Mg2+ b. I or Ic. Clor Brd. For Ne 3e. N or P38) Put the following in order of increasing radius: BrSe2- Sr2+ Kr Rb+ 2+ + Sr Rb Kr Br Se29) Which is higher: First, Second or third Ionization energy? 10) What element in the 3rd period will have the highest third ionization energy?/ 1060 Hixson-Lied Student Success Center 515-294-6624 [email protected] http://www.si.iastate.edu 11) Show the Zeff trend on the periodic table: Smaller Z eff Larger Z eff 12) Show the atomic radius trend on the periodic table: Smallest radius Largest radius 13) Show the Ionization energy trend on the periodic table: (Energy it takes to remove and electron) Highest Ionization energy Lowest Ionization energy 14) Show the Electron Affinity trend on the periodic table: (energy required to add an electon to a gaseous atom/molecule) Exceptions 2nd column and Nitrogen column Most Negative Closest to 0 15) Show the Electronegativity trend on the periodic table: (ability of an atom in a molecule or solid to attract electrons to itself numbers only make sence in comparison) highest lowest Metal oxides are basic in nature CaO(s) + H2O Ca(OH)2 Non Metal Oxides are acidic CO2 + H2O H2CO3