Rec7_f04 - Recitation Activity 7 (Chem 121) Periodic Trends...

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Recitation Activity 7 (Chem 121) Chapters 7-8 Periodic Trends 1. Consider the successive ionization energies of four elements from the 4 th period (row) of the periodic table, The s-block metal, Calcium (Ca), the transition metal, Titanium (Ti), the metalloid, Germanium (Ge), and the nonmetal, Selenium (Se). Element 1 st IE (kJ/mol) 2 nd IE (kJ/mol) 3 rd IE (kJ/mol) 4 th IE (kJ/mol) 5 th IE (kJ/mol) 6 th IE (kJ/mol) 7 th IE (kJ/mol) Ca 590 1145 4912 6491 8153 --- --- Ti 659 1309 2652 4174 9581 --- --- Ge 762 1537 3302 4411 9020 --- --- Se 941 2045 2973 4144 6590 7880 14990 a. Write the electron configurations for Ca, Ti, Ge and Se. b. Write equations for the first and fourth ionization energies of titanium. c. Explain the fact that the 1 st , 2 nd and 5 th ionization energies for calcium are smaller than observed for Ti and Ge, while the 3 rd and 4 th ionization energies for calcium are higher than Ti and Ge.
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Rec7_f04 - Recitation Activity 7 (Chem 121) Periodic Trends...

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