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QUESTION 1 1. The Pauli principle states that A. an orbital can hold as many electrons as possible. B. no two electrons in the same atom can have all their quantum numbers the same. C. an electron in an atom can move to another energy level. D. the electron trapped in an atom has particle characteristics. E. the energy of an electron has a specific quantum number. QUESTION 2 1. How many more electrons are required to complete the octet around phosphorus? A.4 B.1 C.3 D.2 E. 6 QUESTION 3 1. Which molecule below is polar? A. IBr B. C2H2 C. CF4 D. BF3 E. CS2 QUESTION 4 1. Which of the following choices is the correct electron configuration for a sulfur atom? A. 3s __3p___ [Ne]↑↓ ↑↑↑ B. 3s [Ne] __3p____ ↑↓ ↑↓ ↑↓ C. 3s [Ne]↑↓ ↑↓↑↑ D. 3s _3p____ [Ne]↑↓ ↑↓ ↑↓ __3p____ E. QUESTION 5 3s __3p___ [Ne]↑ ↑↓↑ ↑↓ 1. A central atom has two lone pair of electrons around it and two single bonds to other atoms. What is the electronic geometry around the central atom? A. octahedron B. trigonal bipyramid C. square pyramid D. tetrahedron E. bent QUESTION 6 1. What is the correct electron configuration for Ba and Ba2+? A.[Xe] 6p2, [Xe] 6p1 B.[Xe]6s1, [Xe]6s2 C.[Xe]6s2, [Xe]6s1 D.[Xe] 6s2, [Xe] E. [Xe] 5s2, [Xe] QUESTION 7 1. What is the maximum number of electrons that can fill all the orbitals of a f subshell? A.5 B. 14 C.8 D.7 E. 10 QUESTION 8 1. Which of the five basic geometries for molecules and ions has the smallest bond angle? A. These all have the same bond angles. B. planar triangular C. linear D. octahedral E. tetrahedral QUESTION 9 1. Which species is most likely covalently bonded? A. MgBr2 B. CO C. CsCl D. CaF2 E. NaF QUESTION 10 1. Based on the Lewis structure, the number of electron domains in the valence shell of the boron atom in the BF3 molecule is A.3 B.4 C.4 D.2 E. 5 QUESTION 11 1. Which of the following species has the least polar bond? A. HF B. HCl C. HI D. HBr QUESTION 12 1. A correct description for the electron configuration of an iron atom is A.[Ar] 4s2 3d6, diamagnetic. B. [Ar] 3s2 3d6, paramagnetic. C. [Ar] 3d8, paramagnetic. D.[Ar] 4s2 3d6, paramagnetic. E. [Ar] 4s1 3d7, paramagnetic. QUESTION 13 1. Thenotationforthesubshellwithn=4andl=2is A.4f subshell. B. There is no subshell fitting this description. C. 4p subshell. D.4d subshell. E. 4s subshell. QUESTION 14 1. Chlorine tends to form a monatomic ion, which has the electronic configuration of a noble gas. What is the electron configuration of that noble gas? A.1s2 2s2 2p6 3p6 B.1s2 2s2 2p6 C.1s2 2s2 2p6 3s2 3p6 4s2 D.1s2 2s2 2p6 3s2 3p4 E. 1s2 2s2 2p6 3s2 3p6 QUESTION 15 1. Based on the Lewis structure, the number of electron domains in the valence shell of the boron atom in the BF3 molecule is A.4 B.5 C.2 D.3 E. 1 QUESTION 16 1. Predict the type of bonding (covalent or ionic) in the following: calcium bromide, carbon tetrachloride, iron (III) oxide, sulfur dioxide, carbon disulfide A.ionic, covalent, covalent, covalent, ionic B. ionic, ionic, ionic, covalent, covalent C. covalent, ionic, covalent, ionic, ionic D.ionic, covalent, ionic, covalent, covalent QUESTION 17 1. The valence shell electron pair repulsion theory is based on the concept that A. electron pairs tend to stay as far apart as possible to minimize repulsions between them. B. electrons are added to the lowest energy atomic orbitals first. C. electronegativity tends to promote the formation of polar bonds. D. the position and speed of the electron are somewhat uncertain. E. only two electrons can occupy an atomic orbital. QUESTION 18 1. Which atom has the electron configuration of [Ar]4s23d104p3? A. Bi B. As C.N D. Sb E. P QUESTION 19 1. The bond angle in H2O is expected to be approximately A.180 degrees. B. 120 degrees. C. 145 degrees. D.90 degrees. E. 109.5 degrees. QUESTION 20 1. How many orbitals are in the n = 2 shell. A. 2 B. 8 C. 4 D. 3 E. 1

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