22. An element has the electron configuration [Kr] . The element is a(n)
(A) nonmetal
(B) transition element
(C) metal
(D) lanthanide
(E) actinide

27. An element has the electron configuration \( [Kr] 4d^{10}5s^25p^2 \). The element is a(n) (A) nonmetal (B) transition metal (C) lanthanide (D) metal (E) chalcogenide

23. Which statements about hydrogen are true? I: H has a lower ionization energy than He； II: H- is smaller than H； III: H has a higher effective nuclear charge than He； IV: H is always a metal； V: H does not have a second ionization energy. (A) I, V (B) II, IV (C) I, III, V (D) II, IV, V (E) I, III, IV, V

24. Which of the following statements is incorrect? (A) ionic bonding results from the transfer of electrons from one atom to another (B) dipole moments result from the unequal distribution of electrons in a molecule (C) the electrons in a polar bond are found nearer to the more electronegative element (D) a molecule with very polar bonds can be nonpolar (E) linear molecules cannot have a net dipole moment

25. Consider the following molecules. I: BF3； II: CHBr3 (C is the central atom.)； III: Br2； IV: XeCl2； V: CO； VI: SF4. Select the molecule(s) that have a zero net dipole moment. (A) III, V (B) I, III, IV (C) III, IV, V (D) I, III, IV, VI (E) none of these

26. Which of the following ionic compounds has the largest lattice energy； that is, which has the lattice energy most favorable to a stable lattice? (A) Csl (B) Lil (C) LiF (D) CsF (E) MgO

27. As a general pattern, electronegativity is inversely related to (A) ionization energy (B) atomic size (C) polarity of the atom (D) the number of neutrons in the nucleus (E) two of these

28. Which of the following has the shortest N-O bond? (A)  (B) NO+ (C) N2 (D) (E) none of these

29. Choose the element that is the strongest reducing agent in the gas phase. (A) Li (B) Na (C) K (D) Rb (E) Cs

30. Which of the following species has the largest dissociation energy? (A) O2 (B) (C) (D) (E)

31. Consider the molecular-orbital energy-level diagrams for O2 and NO. Which of the following is true? I: Both molecules are paramagnetic； II: The bond strength of O2 is greater than the bond strength of NO； III: NO is an example of a homonuclear diatomic molecule； IV: The ionization energy of NO is smaller than the ionization energy of NO+. (A) I only (B) I and II only (C) I and IV only (D) II and III only (E) I, II and IV

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