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ISU CHEM 167 - handout

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Ch 6/7Supplemental InstructionIowa State UniversityLeader: LaurenCourse: Chem 167Instructor: HolmeDate: 10/08/091. How do the sizes of atoms change as we move… a) from left to right across a row in the periodic table? b) from top to bottom in a group in the periodic table? c) Arrange the following atoms in order of increasing atomic radius: F, P, S, As. 2. a) What is effective nuclear charge? b) How does the effective nuclear charge experienced by the valence electrons of an atom vary going from left to right across a period of the periodic table?3. Which will experience the greater effective nuclear charge, the electrons in the n=3 shell in Ar or the n=3 shell in Kr? Why?4. Consider the following spheres. Which one do you suppose represents Ca, which Ca2+, and which Mg2+? 4. a) Why are ionization energies always positive quantities? b) Why is the second ionization energy of an atom always greater than its first ionization energy?Supplemental Instruction1060 Hixson-Lied Student Success Center v 294-6624 v www.si.iastate.edu5. Take a few moments to study the following graph of atomic number versus ionization energies. How would you explain the ‘kinks’ in the graph? 6. What is the relationship between the ionization energy of an anion with a 1- charge such as F- and the electron affinity of the neutral atom, F?7. Arrange the following substances according to their expected lattice energies, listing them from lowest lattice energy to the highest: NaBr, LiCl, RbBr, MgO. 8. What is meant by the term covalent bond?9. Which of these elements is unlikely to form covalent bonds: S, H, K, Ar, Si?


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ISU CHEM 167 - handout

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