Name:    Practice Test #9 - Atomic Structure

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

1.

Which of the following regions of the electromagnetic spectrum has the longest wavelengths?
 a. microwave b. infrared c. x-ray d. gamma ray e. visible

2.

An argon ion laser emits light at 488 nm. What is the frequency of this radiation?
 a. 4.07 x 10-19 s-1 b. 1.63 x 10-15 s-1 c. 1.46 x 102 s-1 d. 2.05 x 106 s-1 e. 6.14 x 1014 s-1

3.

The ____ of a photon of light is ____ proportional to its frequency and ____ proportional to its wavelength.
 a. amplitude, directly, inversely b. energy, inversely, directly c. energy, directly, inversely d. velocity, inversely, directly e. velocity, directly, inversely

4.

Planck suggested that all energy gained or lost by an atom must be some integral multiple of a minimum amount of energy called a ____.
 a. Bohr b. frequency c. photon d. transition e. quantum

5.

A common infrared laser operates at 1.06 ´ 103 nm. What is the energy of a photon with this wavelength?
 a. 7.02 x 10-40 J b. 6.25 x 10-28 J c. 3.54 x 10-15 J d. 1.87 x 10-19 J e. 2.83 x1014 J

6.

A red laser pointer emits light at a wavelength of 635 nm. If the laser emits 7.5 ´ 10-4 J of energy per second in the form of visible radiation, how many photons per second are emitted from the laser?
 a. 4.2 x 10-16 photons/sec b. 2.4 x 1015 photons/sec c. 6.3 x 1017 photons/sec d. 2.7 x 1022 photons/sec e. 1.8 x 1036 photons/sec

7.

If the energy of 1.00 mole of photons is 441 kJ, what is the wavelength of the light?
 a. 271 nm b. 451 nm c. 680 nm d. 732 nm e. 891 nm

8.

According to the Bohr model for the hydrogen atom, the energy necessary to excite an electron from n = 2 to n = 3 is ____ the energy necessary to excite an electron from n = 4 to n = 5.
 a. less than b. greater than c. equal to d. either equal to or greater than e. either less than or equal to

9.

Which of the following transitions in a hydrogen atom would emit the lowest energy photon?
 a. n = 1 to n = 2 b. n = 3 to n = 2 c. n = 5 to n = 1 d. n = 2 to n = 8 e. n = 6 to n = 5

10.

Which of the following statements is INCORRECT?
 a. The location and the energy of an electron in an atom can be simultaneously known with little or no uncertainty. b. The energies of an atom's electrons are quantized. c. Quantum numbers define the energy states and the orbitals available to an electron. d. The behavior of an atom's electrons can be described by standing waves. e. Electrons have both wave and particle properties.

11.

What type of orbital is designated n = 3, l = 2, ml = -1?
 a. 3s b. 3p c. 3d d. 2f e. 2d

12.

What type of orbital is designated n = 2, l = 0, ml = 0?
 a. 2s b. 2p c. 2d d. 2f e. none

13.

What shell contains a total of 9 orbitals?
 a. n = 1 b. n = 2 c. n = 3 d. n = 4 e. n = 5

14.

How many orbitals have the following set of quantum numbers: n = 6, l = 3, ml = -2?
 a. 0 b. 1 c. 3 d. 6 e. 7

15.

All of the following sets of quantum numbers are allowed EXCEPT
 a. n = 6, l = 0, ml = +1 b. n = 5, l = 4, ml = 0 c. n = 4, l = 1, ml = -1 d. n = 3, l = 2, ml = +2 e. n = 1, l = 0, ml = 0

16.

What is the total number of orbitals having n = 5 and l = 1?
 a. 1 b. 2 c. 3 d. 5 e. 10

17.

Which of the following properties is associated with the value of the ml quantum number?
 a. the number of electrons in an orbital b. the size of an orbital c. the shape of an orbital d. the energy of an orbital e. the orientation in space of an orbital

18.

Which of the following orbitals might have ml = -2?
 a. s b. s and p c. p and d d. d and f e. p, d, and f

19.

The n = ____ shell is the lowest that may contain p-orbitals.
 a. 2 b. 3 c. 4 d. 5 e. 6

20.

Which of the following diagrams represent p-orbitals?

 a. (I) only b. (II) only c. (III) only d. (IV) only e. (I) and (II)