Chapter 4 Chemistry
How many possible orientations does an s orbital have? a. 1 b. 2 c. 3 d. 5
a. 1
What is the correct electron configuration for a ground-state atom with 7 electrons? a. 1s 2 2s 2 2p3 b. 1s 2 2s 2 2p2 3s 1 c. 1s 2 2s 3 2p2 d. 1s 2 2s 5
a. 1s 2 2s 2 2p3
How many possible values are there for the spin quantum number? a. 2 b. 3 c. 4 d. 5
a. 2
The diagram ^ represents two electrons with a. opposite spin states. b. the same spin state. c. different energies. d. the same energy.
a. opposite spin states.
.When electromagnetic radiation strikes the surface of a metal, electrons are ejected from the metal's surface. This is a description of the a. photoelectric effect. b. quantum theory. c. Aufbau principle. d. effects of diffraction.
a. photoelectric effect.
The electron configuration below represents a ground-state atom of which element? 1s 2 2s 2 2p6 3s 2 3p4 a. sulfur b. oxygen c. silicon d. selenium
a. sulfur
Which of these does the angular momentum quantum number indicate? a. the shape of an orbital b. the main energy level of an electron c. the orientation of an orbital around the nucleus d. the spin state of an electron in an orbital
a. the shape of an orbital
What is the frequency of a photon whose energy is 3.4 1019 J? (h 6.626 x 10^-34 J·s) a. 8.8 x 10^26 Hz b. 5.1 x 10^14 Hz c. 1.9 x10^-15 Hz d. 2.3 x 10^-52 Hz
b. 5.1 x 10^14 Hz
A photon is emitted from a gaseous atom when an electron moves to its ground state from a(n) a. inner shell. b. excited state. c. n 0 state. d. less energetic state.
b. excited state.
Which of the following quantum numbers describes a p-orbital in the third energy level? a. n =3, l =0, m =0 b. n =3, l =1, m =0 c. n =3, l =1, m =0 d. n =4, l =1, m =0
b. n=3, l=1, m=0
The distance between corresponding points on adjacent waves is the wave's a. energy. b. wavelength. c. frequency. d. speed.
b. wavelength.
In which orbital(s) are all the inner-shell electrons located in an atom of magnesium that is in the ground state? a. 1s b. 1s, 2s c. 1s, 2s, 2p d. 1s, 2s, 2p, 3s
c. 1s, 2s, 2p
What is the atomic number of the element with the noble-gas notation [Kr]5s 1 ? a. 35 b. 36 c. 37 d. 38
c. 37
What is the frequency of light whose wavelength is 633 nm? a. 4.74 x 10^-4 Hz b. 4.74 x 10^-2 Hz c. 4.74 x 10^14 Hz d. 4.74 x 10^16 Hz
c. 4.74 x 10^14 Hz
The electron configuration below violates a. the Pauli exclusion principle. b. the Aufbau principle. c. Hund's rule. d. Both (a) and (c)
c. Hund's rule.
According to Einstein, which of the following can behave like a wave and also like a stream of particles? a. a noble gas b. the atomic nucleus c. electromagnetic radiation d. a hydrogen atom in the ground state
c. electromagnetic radiation
What is the highest occupied energy level in an atom of strontium in its ground state? a. n 3 b. n 4 c. n 5 d. n 6
c. n 5
The total number of orbitals that can exist at a given main energy level, n, is equal to a. n. b. 2n2 . c. n2 . d. n 1.
c. n2 .
Which are the sublevels in an energy level of n 3? a. s, p, and f b. s, d, and f c. s, p, and d d. p, d, and f
c. s, p, and d
How many wavelengths of light are represented in the diagram below? a. 1 b. 6 c. 7 d. 8
d. 8
What is the correct noble-gas notation for the electron configuration of an atom of chlorine? a. [Ar]3s 2 3p5 b. [Ne]3s 2 3p4 c. [Ar]3s 2 3p4 d. [Ne]3s 2 3p5
d. [Ne]3s 2 3p5
When an atom in an excited state emits a photon of radiation, the energy of the photon is equal to the a. energy of the atom's excited state. b. energy of the atom's final state. c. total energy of the atom's excited state and its final state. d. difference in energy between the atom's excited state and its final state.
d. difference in energy between the atom's excited state and its final state.
The lowest energy state of an atom is its a. highest-occupied energy level. b. principle quantum number. c. electron configuration. d. ground state.
d. ground state.
Which of the following types of electromagnetic radiation has the lowest frequency? a. X rays b. infrared light c. ultraviolet light d. microwaves
d. microwaves
