Chapter 16?Atomic Electron Configurations
and Chemical Periodicity
MULTIPLE CHOICE
1. Which of the following statements
are CORRECT?
| 1. | A paramagnetic substance is attracted to a magnetic field. |
| 2. | Atoms with one or more unpaired electrons are paramagnetic. |
| 3. | Electron spin is quantized. |
| a. | 1 only |
| b. | 2 only |
| c. | 3 only |
| d. | 1 and 2 |
| e. | 1, 2, and 3 |
ANS: E OBJ: 8.1 Electron Spin
3. The Pauli exclusion principle states that
spins.ANS: A OBJ: 8.2 The Pauli Exclusion
Principle
4. How many electrons can be described by the following quantum numbers: n = 4, ? = 3, m? = -2, ms = +1/2?
| a. | 0 |
| b. | 1 |
| c. | 2 |
| d. | 3 |
| e. | 6 |
ANS: B OBJ: 8.2 The Pauli Exclusion
Principle
5. How many electrons can be described by the quantum numbers n = 5, ? = 3, ms = -1/2?
| a. | 1 |
| b. | 3 |
| c. | 5 |
| d. | 7 |
| e. | 9 |
ANS: D OBJ: 8.2 The Pauli Exclusion
Principle
6. How many electrons can be described by the quantum numbers n = 7, ? = 1?
| a. | 0 |
| b. | 2 |
| c. | 6 |
| d. | 7 |
| e. | 14 |
ANS: C OBJ: 8.2 The Pauli Exclusion
Principle
7. What is the maximum number of electrons that can occupy the n = 5 shell?
| a. | 5 |
| b. | 10 |
| c. | 14 |
| d. | 25 |
| e. | 50 |
ANS: E OBJ: 8.2 The Pauli Exclusion
Principle
8. What is the maximum number of electrons that can occupy the n = 2 shell?
| a. | 4 |
| b. | 8 |
| c. | 18 |
| d. | 32 |
| e. | 50 |
ANS: B OBJ: 8.2 The Pauli Exclusion
Principle
9. Which one of the following sets of quantum numbers is NOT allowed?
| a. | n = 6, ? = 0, m? = 0, ms = +1/2 |
| b. | n = 5, ? = 3, m? = 1, ms = +1/2 |
| c. | n = 4, ? = 2, m? = -3, ms = -1/2 |
| d. | n = 3, ? = 1, m? = -1, ms = +1/2 |
| e. | n = 2, ? = 0, m? = 0, ms = -1/2 |
ANS: C OBJ: 8.2 The Pauli Exclusion
Principle
10. Which of the following sets of quantum numbers is allowed?
| a. | n = 2, ? = 1, m? = 1, ms = -1/2 |
| b. | n = 3, ? = 2, m? = 1, ms = +1 |
| c. | n = 3, ? = 1, m? = -3, ms = -1/2 |
| d. | n = 4, ? = 4, m? = -1, ms = +1/2 |
| e. | n = 5, ? = 2, m? = +2, ms = -1 |
ANS: A OBJ: 8.2 The Pauli Exclusion
Principle
11. Which of the following statements
regarding subshell filling order are CORRECT?
| 1. | Electrons are assigned to the 4s subshell before they are assigned to the 3d subshell. |
| 2. | Electrons are assigned to the 4f subshell before they are assigned to the 6s subshell. |
| 3. | Electrons are assigned to the 5d subshell before they are assigned to the 6p subshell. |
| a. | 1 only |
| b. | 2 only |
| c. | 3 only |
| d. | 1 and 3 |
| e. | 1, 2, and 3 |
ANS: D OBJ: 8.3 Atomic Subshell Energies
and Electron Assignments
12. Which of the following statements
concerning ground state electron configurations are CORRECT?
| 1. | In a hydrogen atom with one electron, the 2s and 2p orbitals have different energy. |
| 2. | For a lithium atom with three electrons, the 2s and 2p orbitals have different energies. |
| 3. | The effective nuclear charge felt by an electron in a 2p orbital is larger for carbon than for fluorine. |
| a. | 1 only |
| b. | 2 only |
| c. | 3 only |
| d. | 1 and 3 |
| e. | 1, 2, and 3 |
ANS: B OBJ: 8.3 Atomic Subshell Energies
and Electron Assignments
13. Which of the following elements is an s-block element?
| a. | C |
| b. | Cd |
| c. | Cs |
| d. | Cl |
| e. | Cf |
ANS: C OBJ: 8.4 Atomic Electron Configurations
15. Which of the following atoms is paramagnetic?
| a. | Se |
| b. | Cd |
| c. | Ar |
| d. | He |
| e. | Ca |
ANS: A OBJ: 8.4 Atomic Electron Configurations
16. Which of the following atoms is diamagnetic?
| a. | Rb |
| b. | C |
| c. | F |
| d. | Cu |
| e. | Sr |
ANS: E OBJ: 8.4 Atomic Electron Configurations
17. Which element has the electron configuration 1s22s22p63s23p4?
| a. | Mg |
| b. | S |
| c. | Si |
| d. | Se |
| e. | Ga |
ANS: B OBJ: 8.4 Atomic Electron Configurations
18. Which element has the electron configuration [Ar]3d104s1?
| a. | Cu |
| b. | Zn |
| c. | Ga |
| d. | Ag |
| e. | Co |
ANS: A OBJ: 8.4 Atomic Electron Configurations
20. Hund's rule states that the most stable arrangement of electrons (for a ground state electron configuration)
| a. | has a filled valence shell of electrons. |
| b. | has two electrons per orbital, each with identical spins. |
| c. | has m? values greater than or equal to zero. |
| d. | has the maximum number of unpaired electrons, all with the same spin. |
| e. | has two electrons per orbital, each with opposing spins. |
ANS: D OBJ: 8.4 Atomic Electron Configurations
21. Which element has the following
electron configuration?
| a. | P |
| b. | S |
| c. | O |
| d. | N |
| e. | F |
ANS: D OBJ: 8.4 Atomic Electron Configurations
22. Which element has the following
electron configuration?
| a. | Br |
| b. | Se |
| c. | S |
| d. | Cl |
| e. | Ge |
ANS: B OBJ: 8.4 Atomic Electron Configurations
23. What is a possible set of quantum
numbers for the unpaired electron in the orbital box diagram below?
| a. | n = 3, ? = 1, m? = -1, ms = +1/2 |
| b. | n = 3, ? = 2, m? = -1, ms = -1/2 |
| c. | n = 3, ? = 2, m? = -2, ms = +1/2 |
| d. | n = 4, ? = 0, m? = 0, ms = +1/2 |
| e. | n = 4, ? = 1, m? = -1, ms = +1/2 |
ANS: E OBJ: 8.4 Atomic Electron Configurations
24. For which of the following atoms is the common ion paramagnetic?
| a. | Al |
| b. | Mg |
| c. | Ni |
| d. | F |
| e. | H |
ANS: C OBJ: 8.5 Electron Configurations
of Ions
25. Which 3+ ion has the ground state electron configuration [Kr]4d5?
| a. | Ru |
| b. | Fe |
| c. | Ag |
| d. | Tc |
| e. | Nb |
ANS: A OBJ: 8.5 Electron Configurations
of Ions
26. If the ground state electron configuration of an element is [Ar]3d104s24p3, what is the typical charge on the monatomic anion of the element?
| a. | 2+ |
| b. | 1+ |
| c. | 1- |
| d. | 2- |
| e. | 3- |
ANS: E OBJ: 8.5 Electron Configurations
of Ions
27. What is the ground state electron configuration for Cr3+?
| a. | [Ar] |
| b. | [Ar]3d34s2 |
| c. | [Ar]3d44s1 |
| d. | [Ar]3d3 |
| e. | [Ar]3d74s2 |
ANS: D OBJ: 8.5 Electron Configurations
of Ions
31. What 2+ ion has the following
ground state electron configuration?
| a. | Ni2+ |
| b. | Co2+ |
| c. | Ca2+ |
| d. | Cu2+ |
| e. | Mn2+ |
ANS: B OBJ: 8.5 Electron Configurations
of Ions
33. Which of the following cations has four unpaired electrons in the ground state?
| a. | Ni2+ |
| b. | Fe2+ |
| c. | Pb2+ |
| d. | Mn2+ |
| e. | Cu2+ |
ANS: B OBJ: 8.5 Electron Configurations
of Ions
34. In general, atomic radii
| a. | decrease down a group and remain constant across a period. |
| b. | decrease down a group and increase across a period. |
| c. | increase down a group and increase across a period. |
| d. | increase down a group and remain constant across a period. |
| e. | increase down a group and decrease across a period. |
ANS: E OBJ: 8.6 Atomic Properties and
Periodic Trends
35. Place the following atoms in order of increasing atomic radii: Ca, Mg, P, and Cl.
| a. | Cl < P < Mg < Ca |
| b. | Mg < P < Cl < Ca |
| c. | Ca < Mg < P < Cl |
| d. | P < Cl < Mg < Ca |
| e. | Ca < Cl < P < Mg |
ANS: A OBJ: 8.6 Atomic Properties and
Periodic Trends
36. Place the following atoms in order of increasing atomic radii: Se, O, S, and As.
| a. | O < S < Se < As |
| b. | O < S < As > Se |
| c. | As < Se < S < O |
| d. | Se < As < S < O |
| e. | S < As < O < Se |
ANS: A OBJ: 8.6 Atomic Properties and
Periodic Trends
37. Which one of the following statements is INCORRECT?
| a. | Ionization energy is always a positive value. |
| b. | Ionization energy is the energy required to remove an electron from a gaseous atom. |
| c. | For any element, the second ionization energy is larger than the first ionization energy. |
| d. | Ionization energy decreases across a periodic of the periodic table. |
| e. | Ionization energy decreases down a group of the periodic table |
ANS: D OBJ: 8.6 Atomic Properties and
Periodic Trends
38. Which of the following chemical equations refers to the second ionization of Mg?
| a. | Mg(s) + 2e- ? Mg2-(s) |
| b. | Mg(s) ? Mg+(s) + e- |
| c. | Mg(g) ? Mg2+(g) + 2e- |
| d. | Mg+(g) ? Mg2+(g) + e- |
| e. | Mg2+(g) + e- ? Mg+(g) |
ANS: D OBJ: 8.6 Atomic Properties and
Periodic Trends
39. Which of the following elements would have the greatest difference between the first and the second ionization energies?
| a. | Mg |
| b. | Al |
| c. | K |
| d. | Ca |
| e. | Sr |
ANS: C OBJ: 8.6 Atomic Properties and
Periodic Trends
40. Rank K, Li, and Cs in order of increasing first ionization energy.
| a. | K < Cs < Li |
| b. | Cs < K < Li |
| c. | Cs < Li < K |
| d. | Li < Cs < K |
| e. | Li < K < Cs |
ANS: B OBJ: 8.6 Atomic Properties and
Periodic Trends
41. The change in energy for the following
reaction is referred to as the ____ for fluorine.
F(g) + e- ? F-(g)
| a. | oxidation energy |
| b. | electron affinity |
| c. | electronegativity energy |
| d. | first ionization energy |
| e. | second ionization energy |
ANS: B OBJ: 8.6 Atomic Properties and
Periodic Trends
42. Which of the following elements has the most negative electron affinity?
| a. | Li |
| b. | B |
| c. | C |
| d. | N |
| e. | F |
ANS: E OBJ: 8.6 Atomic Properties and
Periodic Trends
43. Which elements have no affinity for electrons?
| a. | transition metals |
| b. | main group metals |
| c. | main group nonmetals |
| d. | semiconductors |
| e. | noble gases |
ANS: E OBJ: 8.6 Atomic Properties and
Periodic Trends
45. Place the following ions in order from smallest to largest ionic radii: P3-, K+, Na+, and Cl-.
| a. | Na+ < K+ < Cl- < P3- |
| b. | K+ < Na+ < Cl- < P3- |
| c. | Cl- < P3- < Na+ < K+ |
| d. | Cl- < P3- < K+ < Na+ |
| e. | P3- < Cl- < K+ < Na+ |
ANS: A OBJ: 8.6 Atomic Properties and Periodic Trends