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Unformatted text preview: CHEM 1A03 TUTORIAL #3A May 18 - 20, 2010 Questions – Chapter 9 _____________________________________________________________________ Page 1 of 2 The following problems (1-12) are based on material from Chapter 9. 1) What is the general electronic configuration (where n = principal quantum number) that best describes the halogens as a group. A) ns 1 np 6 B) ns 2 np 4 C) ns 2 sp 5 D) ns 2 np 6 E) ns 2 np 3 2. a) Which of the following gaseous atoms is smallest : P, Cl, Ca, or Si? b) Which of the following gaseous atoms has the highest ionization energy : Li, Ne, Na, Ar? 3. Arrange the following gaseous ions in the order of decreasing ionic radius (from largest radius to smallest radius) : S 2 − , K + , Ca 2+ , Cl − 4. Which of the following orders of the sizes of halogen atoms and ions is/are correct? a) I − > I > Br b) Cl > F > I c) F − > Cl − > I − d) Br − > Cl − > F e) Cl > F > F − 5. Why is the electron affinity so positive for the group 2 elements? A) The added electron would have to go into a new shell. B) The added electron would have to be added into the half-filled p subshell. C) The added electron would have to be added into the p subshell. D) The groups 2 elements are diatomic elements. E) Electrons can't be added to gases. 6. The electron affinity of a chlorine atom can be determined by using a laser light to ionize the chloride ion in the gas phase. a) Write the balanced equation for the ionization of gaseous chloride ions. b) Write the balanced equation for the process whose energy change is called "electron affinity" for chlorine. c) By referring to Figure 9.10 in Petrucci, calculate the wavelength, in nm, of laser light that corresponds to the electron affinity for chlorine. d) To what region of the electromagnetic spectrum does this wavelength correspond? 7. Atoms can be categorized by their behaviour in a magnetic field, which depends on the number of unpaired electrons in the atom. An atom with no unpaired electrons is called diamagnetic. An atom with one or more unpaired electrons is called paramagnetic. a) Give the atomic symbols for those atoms from Z = 1 to Z = 20 that are paramagnetic in the ground electronic state. CHEM 1A03 TUTORIAL #3A May 18 - 20, 2010 Questions – Chapter 9 _____________________________________________________________________...
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This note was uploaded on 05/24/2010 for the course CHEMISTRY 1A03 taught by Professor Dr.p.lock during the Spring '08 term at McMaster University.
- Spring '08