How does the electron structure of an isolated atom differ from that of a solid material? Select the most appropriate answer. Select one: a. The valence electrons of each atom disappear in the bulk material. O b. An isolated atom has an electron band structure. Solid materials have discrete electron energy states. C. An isolated atom has discrete electron energy states. Solid materials have four electron band structures. d. There is no difference in electron structure between an isolated atom and a solid material;

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11. For the CH4 molecule, VSEPR Theory states that: a. Hydrogen atoms will cluster together to get as far away as possible from the electron cloud of carbon b. A tetrahedral shape will form, because the electrons of the hydrogen atoms will repel each other, creating the maximum possible amount of space between each hydrogen atom c. A pyramidal shape will form because of a lone pair of electrons on the carbon d. This molecule is impossible 12. For the CH4 molecule, Valence Bond Theory states that: a. Carbon will form sp hybrid orbitals b. Carbon will form sp? hybrid orbitals c. Hydrogen will form sp hybrid orbitals d. pi bonds will form between carbon and hydrogen 13. Which atom or ion could not have the following electron configuration: 1s'2s 2p°3s°3p° а. Ar b. Cl c. S d. p3- 14. A substance is found to be soluble in water, but not conductive in solution. The substance is most likely: a. lonic b. Non-polar covalent c. Polar covalent d. Metallic

11. What is the electron-domain geometry of water molecule (H2O)? a. bent b. tetrahedral c. trigonal planar d. linear 12. Write the correct Lewis dot structure for O2. Which statement correctly describes the structure of the whole molecule? a. There is a double bond and four lone pairs. b. There is a double bond and six lone pairs. c. There is a single bond and six lone pairs. d. There is a single bond, a double bond, and six lone pairs. 13. If there are four (4) electron pairs around the central atom of a molecule, these electron pairs are in a/n a. trigonal planar b. trigonal pyramidal arrangement. C. octahedral d. tetrahedral 14 The molecular geometry of the molecule NF3 is a. linear b. trigonal pyramidal c. tetrahedral d. trigonal planar 15 Which of the following species will exhibit tetrahedral molecular geometry? d. PCI5 a. CCI4 b. CO2 C. O3

7. Electronegativity All about ammonia (NH3). Sb (antimony, atomic #51,) is in same Periodic Table column as N. The boiling point of SÜH3 (stibine, -17 °C) is slightly higher than NH3 (-33 °C). H 2.1 N 3.0 Sb 2.1 7a. What kinds of intermolecular interactions would occur in NH3 (1)? What kinds of intermolecular interactions would occur in SbH3 (1)? Is it surprising or expected that stibine would have a higher boiling point than ammonia? What could account for this higher boiling point?

The PH3 molecule has a tetrahedral arrangement of the electron pairs. Which of the following is TRUE regarding the H-P-H angles in the molecule? Select one: A. The angles are slightly greater than those in a perfect tetrahedron. B. The angles are equal to those in a perfect tetrahedron. C. The angles are slightly less than those in a perfect tetrahedron. D. None of the above.

The molecular orbital (MO) diagram of OF is given below. Answer Questions 15 – 18. 2p, 2p, 2p, 2p. 2p, 2p. 25 25 OF F