Chemistry Multiple Choice Questions: Electronic Configuration, Bonding, and Properties

31. Tellurium is a Group 6A element in Period 5. What would you expect for the valence-shell configuration of tellurium? ( ) A. 5s'2' 5p'4' B. 5s'2' 5p'6' C. 6s'2' 6p'4' D. 6s'2' 6p'6'

32. Thallium has the ground-state configuration [Xe]4f'14'5d'10'6s'2'6p'1'. Which of the following statements is correct? ( ) A. It is a main-group element. B. It is a d-transition element. C. It is an f-transition element. D. It is an s-block element.

33. For the element with Z = 20, give its group and period in the periodic table. ( ) A. group 4A, period 2 B. group 4A, period 4 C. group 2A, period 4 D. group 2A, period 2

34. What hybrid orbitals would be expected for the central atom of BF3? ( ) A. sp'1' B. sp'2' C. sp'3' D. sp'4'

35. If the electron configuration of O2 is KK(σ2s)'2'(σ2s)'2'(π2p)'4'(σ2p)'2'(π2p)'2', what is the magnetic character of O2? ( ) A. paramagnetic B. diamagnetic C. not sure D. any one

36. Which of the following bonds is least polar? (electronegativities: C 2.5; O 3.5; Cl 3.0; P 2.1; As 2.0; Br 2.8) ( ) A. P-O B. C-Cl C. As-Br D. C-Br

37. Which of the following is a strong acid? ( ) A. C2H5OH B. H2CO3 C. H2O D. HBr

38. Using solubility rules, predict which of the following is insoluble in water. ( ) A. K2S B. Li2CO3 C. NH4Br D. PbCl2

39. Which is the answer of the following arithmetic equation? ( ) A. 55.669 B. 55.67 C. 56 D. 55.7

40. What is the magnetic property of zinc (Zn)? ( ) A. Not sure. B. diamagnetic C. paramagnetic D. Both diamagnetic and paramagnetic.

Answers: 31. B. 5s'2' 5p'6' 32. A. It is a main-group element. 33. C. group 2A, period 4 34. C. sp'3' 35. A. paramagnetic 36. A. P-O 37. D. HBr 38. D. PbCl2 39. B. 55.67 40. B. diamagnetic