38. Does H3+ show a D3h symmetry or a C2v symmetry? Use molecular orbital diagrams to explain your answer. 補充資料 D3h E 2C3 3C2' ση 253 30, h=12 A1' 1 1 1 1 1 1 (x²+y²), z² A2' 1 1 -1 1 1 -1 Rz E' 2 -1 0 2 -1 0 (x, y) (x²-y², ху) A1" 1 1 1 -1 -1 -1 A2" 1 1 -1 -1 -1 1 Z E" 2 -1 0 -2 1 0 (Rx, Ry) (xz, yz) C2v Ε C2 σν(X2) σ'ν(yz) h=4 A1 1 1 1 1 z, z2, x2, y2 A2 1 1 -1 -1 xy R B1 1 -1 1 -1 X, XZ Ry B2 1-1 -1 1 y, yz Rx

37. The d-orbitals of neighboring transition metal atoms can form different types of MOs. Draw each an example for a σ-, π-, δ-orbital formed by two metal d-orbitals.

36. Draw the structure of ferrocene, and count the number of valence electrons.

28. Which of the following half-reactions occurs at the cathode of a Zn|ZnSO4(1M)||CuSO4(0.1M)|Cu voltaic cell? (A) Zn2+ + 2e- → Zn (B) Zn → Zn2+ + 2e (C) Cu → Cu2+ + 2e (D) Cu2+ + 2e- → Cu (E) None of the above.

27. The metal d-orbitals of an octahedral coordination compound splits into two different energy levels. Into how many energy levels do the metal d-orbitals of a trigonal-bipyramidal coordination compound split? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

26. In a hexagonal-closed packed structure, the (010) surface and the (001) surface form an angle of... (A) 45° (B) 60° (C) 90° (D) 120° (E) The two surfaces are parallel.