26. 0-S-S-O has three resonance Lewis structures that complete the octet for all the atoms. Which statements about these structures are correct? I. All are equivalent. II. All are nonequivalent. III. Two are equivalent, and one is nonequivalent. IV. The formal charges on all the atoms are zero in at least one structure. V. All the bonds have double-bond character. а. III and V d. I and V b. I and IV II and IV e. III, IV, and V с.

17. According to Lewis Octet Theory, the ZH-N-H bond angle in the NH4* cation is...? А. 180° В. 120° С. 109.5° D. 90° E. Not enough information to tell 18. Which of the following ions has the largest atomic size? A. S2- В. СF C. Ca2+ D. K* E. All of the ions above are the same size 19. Which of the following molecules has the widest (largest) ZO-Y-O bond angle? Y represents the central atom in each. A. H2SO4 В. НЗВОЗ С. Si(OH)4 D. HЗPO4 E. The 20-Y-O bond angles are the same in each of the molecules above. 20.Consider the following series of elements. In which series does the ionization energy of the atoms decrease? А. О, N, C В. N, O, C С. N, C, O D. C, O, N Е. С, N, O

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What is the formal charge on the central Xe in the best Lewis structure for the XeO3? a. +2 b. -2 c. -1 d. +1 e. 0