Deck 7: The Structure of Atoms

Question 1

A light emitting diode (L.E.D.)emits photons with an energy of J.What is the energy per mole of photons emitted?

A) J/mol
B) J/mol
C) J/mol
D) J/mol
E) J/mol

Answer 1

J/mol

Question 2

A device operates at a frequency of Hz.What is the wavelength of this radiation?

A) 667 nm
B) nm
C) nm
D) 0.0895 nm
E) nm

Answer 2

667 nm

Question 3

What is the wavelength of a photon having a frequency of 11.7 THz? (1 THz = 10¹⁵ Hz)

A) 0.0390 nm
B) 7.76 $\times$ 10^-24 nm
C) 2.33 $\times$ 10^-15 nm
D) 25.6 nm
E) 2.56 $\times$ 10¹⁶ nm

Answer 3

25.6 nm

Question 4

According to experiments concerned with the photoelectric effect,which of the following will increase the kinetic energy of an electron ejected from a metal surface?
1)increasing the wavelength of the light striking the surface
2)increasing the frequency of the light striking the surface
3)increasing the number of photons of light striking the surface

A) 1 only
B) 2 only
C) 3 only
D) 1 and 3
E) 1,2,and 3

Question 5

What is the energy of a photon of electromagnetic radiation with a wavelength of 451.7 nm?

A) J
B) J
C) J
D) J
E) J

Question 6

Which of the following statements is/are CORRECT?
1)FM radio waves have longer wavelengths than visible radiation and AM radio waves have shorter wavelengths than visible radiation.
2)Magnetic resonance imaging (MRI)uses a mixture of x-rays and gamma rays.
3)Exposure to ultraviolet (UV)radiation can lead to sunburns.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3

Question 7

Which of the following ranks regions of the electromagnetic spectrum in proper order from highest to lowest frequency.

A) radio > ultraviolet> x-rays > visible > microwaves
B) x-rays > ultraviolet > visible > microwaves> radio
C) microwaves > x-rays > ultraviolet > visible > radio
D) ultraviolet > x-rays > microwaves > visible > radio
E) visible > microwaves > radio > ultraviolet > x-rays

Question 8

What is the energy per mole of photons of light with a wavelength of 976.9 nm?

A)
B)
C)
D)
E)

Question 9

Which of the following regions of the electromagnetic spectrum has the lowest frequency?

A) x-ray
B) gamma ray
C) ultraviolet
D) infrared
E) visible

Question 10

A red laser pointer emits light at a wavelength of 488 nm.If the laser emits 7.5 $\times$ 10^-4 J of energy per second in the form of visible radiation,how many photons per second are emitted from the laser?

A) 4.1 $\times$ 10^-19 photons/sec
B) 5.4 $\times$ 10^-16 photons/sec
C) 8.9 $\times$ 10¹⁴ photons/sec
D) 1.8 $\times$ 10¹⁵ photons/sec
E) 2.5 $\times$ 10¹⁸ photons/sec

Question 11

What is the frequency of gamma ray radiation that has a wavelength of 11.4 pm?

A) 3.80 $\times$ 10^-20 s^-1
B) 1.74 $\times$ 10^-14 s^-1
C) 2.63 $\times$ 10⁷ s^-1
D) 3.42 $\times$ 10⁹ s^-1
E) 2.63 $\times$ 10¹⁹ s^-1

Question 12

A device emits light at 761.7 nm.What is the frequency of this radiation?

A) 3.94 $\times$ 10^-4 Hz
B) 1.15 $\times$ 10²⁷ Hz
C) 3.94 $\times$ 10¹⁴ Hz
D) 2.61 $\times$ 10^-37 Hz
E) 2.61 $\times$ 10^-19 Hz

Question 13

The ____ of a photon of light is ____ proportional to its frequency and ____ proportional to its wavelength.

A) energy,directly,inversely
B) energy,inversely,directly
C) velocity,directly,inversely
D) intensity,inversely,directly
E) amplitude,directly,inversely

Question 14

What is the wavelength of a photon that has an energy of J?

A) nm
B) nm
C) 0.842 nm
D) nm
E) nm

Question 15

If the energy of 1.00 mole of photons is 245 kJ,what is the wavelength of the light?

A) 122 nm
B) 488 nm
C) 1220 nm
D) 787 nm
E) 811 nm

Question 16

What is the energy of a photon of electromagnetic radiation with a frequency of Hz?

A) J
B) J
C) J
D) J
E) J

Question 17

What is the energy per mole of photons of light with a frequency of

A)
B)
C)
D)
E)

Question 18

What is the binding energy of an electron in a photosensitive metal (in kJ/mol)if the longest wavelength of light that can eject electrons from the metal is 205 nm?

A) 279 kJ/mol
B) 584 kJ/mol
C) 792 kJ/mol
D) 1.71 $\times$ 10¹⁹ kJ/mol
E) 5.84 $\times$ 10^-20 kJ/mol

Question 19

If a cordless phone operates at a frequency of 9.00 $\times$ 10⁸ s^-1.What is the wavelength of this radiation?

A) 0.333 m
B) 1.99 $\times$ 10^-25 m
C) 3.33 $\times$ 10^-9 m
D) 3.71 $\times$ 10^-18 m
E) 2.70 $\times$ 10¹⁷ m

Question 20

Which of the following colors of visible light has the highest frequency?

A) green
B) orange
C) red
D) yellow
E) blue

Question 21

Which type of experiment demonstrates that an electron has the properties of a wave?

A) nuclear fission
B) electron diffraction
C) light emission from atomic gases
D) mass spectroscopy
E) photoelectric effect

Question 22

For which of the following transitions would a hydrogen atom emit the lowest energy photon?

A) n = 4 to n = 5
B) n = 5 to n = 2
C) n = 4 to n = 3
D) n = 3 to n = 1
E) n = 3 to n = 2

Question 23

If the de Broglie wavelength of an electron is 44 nm,what is its velocity? The mass of an electron is 9.11 $\times$ 10^-31 kg.

A) 6.0 $\times$ 10^-5 m/s
B) 1.2 $\times$ 10³ m/s
C) 1.7 $\times$ 10⁴ m/s
D) 3.1 $\times$ 10¹⁰ m/s
E) 4.8 $\times$ 10²² m/s

Question 24

For which of the following electron transitions would a hydrogen atom emit a photon of the highest energy?

A)

B)

C)

D)

Question 25

For which of the following transitions would a hydrogen atom absorb a photon with the longest wavelength?

A) n = 1 to n = 2
B) n = 4 to n = 6
C) n = 5 to n = 4
D) n = 7 to n = 6
E) n = 6 to n = 7

Question 26

Which type of experiment demonstrates that light has the properties of a particle?

A) nuclear fission
B) electron diffraction
C) light emission from atomic gases
D) mass spectroscopy
E) photoelectric effect

Question 27

According to the Bohr model for the hydrogen atom,the energy necessary to excite an electron from n = 7 to n = 8 is ____ the energy necessary to excite an electron from n = 5 to n = 6.

A) less than
B) greater than
C) equal to
D) either equal to or greater than
E) either less than or equal to

Question 28

The electron in a hydrogen atom,originally in level ,undergoes a transition to a lower level by emitting a photon of wavelength 3745 nm.What is the final level of the electron? (
)

A) 5
B) 6
C) 8
D) 9
E) 1

Question 29

The energy required to break one mole of hydrogen-hydrogen bonds in H₂ is 436 kJ/mol.What is the longest wavelength of light capable of breaking a single H-H bond?

A) 0.474 nm
B) 119 nm
C) 132 nm
D) 274 nm
E) 474 nm

Question 30

What is the de Broglie wavelength of a 148-g baseball traveling at 97.1 mph? ( )

A)
B)
C)
D)
E)

Question 31

Which of the following is/are correct postulates of Bohr's theory of the hydrogen atom ?
1)The energy of an electron in an atom is quantized (i.e.only specific energy values are possible).
2)The principal quantum number (n),specifies each unique energy level.
3)An electron transition from a lower energy level to a higher energy level results in an emission of a photon of light.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3

Question 32

Which of the following statements is INCORRECT?

A) It is not possible to know the exact location of an electron and its exact energy simultaneously.
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 circular orbits around a nucleus.
E) Electrons have both wave and particle properties.

Question 33

The contribution for which de Broglie is best remembered in modern science is

A) his statement that no electron can have identical values for all four quantum numbers.
B) his proposal that particles of matter should be associated with wavelike behavior.
C) his statement that an electron can exist in an atom only in discrete energy levels.
D) his statement that elements show periodic repetition of properties.
E) his statement that electrons occupy all the orbitals of a given sublevel singly before pairing begins.

Question 34

Erwin Schrödinger developed a model for the behavior of electrons in atoms that is known as quantum mechanics.Which of the following statements concerning this model is/are CORRECT?
1)The energy of an electron is quantized.
2)The energy of an electron is equal to its mass multiplied by the square of its velocity.
3)Electrons travel in circular orbits around a nucleus.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3

Question 35

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes a transition from level
(
)

A)
B)
C)
D)
E)

Question 36

If a hydrogen atom in the excited n = 4 state relaxes to the ground state,what is the maximum number of possible emission lines?

A) 1
B) 3
C) 6
D) 8
E) infinite

Question 37

For a proton (mass = 1.673 $\times$ 10^-27 kg)moving with a velocity of 2.83 $\times$ 10⁴ m/s,what is the de Broglie wavelength (in pm)?

A) 0.356 pm
B) 3.56 pm
C) 14.0 pm
D) 7.15 pm
E) 28.5 pm

Question 38

In Bohr's atomic theory,when an electron moves from one energy level to another energy level more distant from the nucleus,

A) energy is absorbed.
B) light is emitted.
C) energy is emitted.
D) no change in energy occurs.
E) none of these

Question 39

Which of the following statements concerning quantum mechanics is/are true?
1)The behavior of submicroscopic particles can sometimes be described as waves.
2)Quantum mechanics limits us to making statistical statements about the location of an electron in an atom.
3)The uncertainty principle is important only for particles of very small mass,such as the electron.

A) 1 only
B) 2 only
C) 3 only
D) 2 and 3
E) 1,2,and 3

Question 40

What is the de Broglie wavelength of an electron traveling at 9.47% of the speed of light? ( )

A)
B)
C)
D)
E)

Question 41

All of the following sets of quantum numbers are allowed EXCEPT

A) n = 6, = 5, = 1
B) n = 6, = 3, = 3
C) n = 2, = 0, = 0
D) n = 5, = 4, = 6
E) n = 5, = 4, = 3

Question 42

A 4p orbital has ?

A) 3 planar nodes and 1 spherical node.
B) 0 planar nodes and 2 spherical nodes.
C) 1 planar node and 2 spherical nodes.
D) 1 planar node and 0 spherical nodes.
E) 2 planar nodes and 3 spherical nodes.

Question 43

What is the value of the orbital angular momentum quantum number ( )for an electron in a 5s orbital?

A) 2
B) 4
C) 3
D) 0
E) 1

Question 44

Which of the following sets of quantum numbers refers to a 4d orbital?

A) n = 2, = 1, = -1
B) n = 2, = 4, = -1
C) n = 4, = 2, = -1
D) n = 4, = 3, = 0
E) n = 4, = 3, = +2

Question 45

The n = ____ shell is the lowest that may contain s-orbitals.

A) 1
B) 2
C) 3
D) 4
E) 5

Question 46

Which of the following properties is associated with the value of the quantum number?

A) the shape of an orbital
B) the size of an orbital
C) the number of electrons in an orbital
D) the energy of an orbital
E) the orientation in space of an orbital

Question 47

Which type of orbital is designated n = 1 and = 0?

A) 1s
B) 2s
C) 3p
D) 4d
E) 1p

Question 48

Which of the following properties is associated with the value of the n quantum number?

A) the number of electrons in an orbital
B) the size of an orbital
C) the orientation in space of an orbital
D) the energy of an orbital
E) the shape of an orbital

Question 49

How many values are there for the magnetic quantum number ( )when the value of the angular momentum quantum number ( )is 4?

A) 14
B) 9
C) 2
D) 4
E) 15

Question 50

What type of orbital is designated n = 4, = 3, = -2?

A) 4s
B) 4p
C) 4d
D) 4f
E) none

Question 51

Which of the following orbital boundary surfaces represent d-orbitals?

A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1 and 4

Question 52

What is the total number of orbitals having n = 4 and = 0?

A) 1
B) 3
C) 5
D) 7
E) 10

Question 53

How many p orbitals are in the n = 3 shell?

A) 1
B) 6
C) 0
D) 5
E) 3

Question 54

A possible value of the magnetic quantum number for a 5d electron is

A) 2.
B) -4.
C) 5.
D) -6.
E) 3.

Question 55

What is the total number of orbitals found in the n = 4 shell?

A) 16
B) 4
C) 20
D) 24
E) 15

Question 56

Which of the following orbital boundary surfaces is a representation of a orbital?

A)
B)
C)
D)
E)

Question 57

Which of the following statements is/are CORRECT?
1)The angular momentum quantum number,
,of an electron in an s orbital is always equal to 0.
2)The magnetic quantum number,
,of an electron in a p orbital is +1,0,or -1.
3)The principle quantum number,n,of an electron in a d orbital must be equal to or greater than 3.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3

Question 58

How many orbitals have the following set of quantum numbers: n = 5, = 1, = -1?

A) 0
B) 1
C) 3
D) 6
E) 7

Question 59

What type of orbital is designated n = 4, = 2, = 0?

A) 4f
B) 4d
C) 4p
D) 4g
E) 4s

Question 60

Which of the following is a representation of a 3d_xz orbital?

A)
B)
C)
D)
E)

Question 61

A ________,designated by the Greek symbol $\varPsi$ ,describes the wave behavior of an electron in an atom.

Question 62

According to Heisenberg's ________ principle,it is impossible to simultaneously measure the exact location and energy of an electron.

Question 63

The difference in energy between adjacent energy levels in an atom _____ as n increases.

Question 64

What evidence does the photoelectric effect provide that photons are not only waves?

Question 65

Which of the following statements is/are CORRECT?
1)A paramagnetic substance is attracted to a magnetic field.
2)An atom with no unpaired electrons is ferromagnetic.
3)Atoms with one or more unpaired electrons are paramagnetic.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 3
E) 1,2,and 3

Question 66

Which of the following sets of quantum numbers (n,l,m_l, m_s)is not permissible?

A) 3 3 -3 +
B) 2 1 -1 +
C) 2 0 0 +
D) 2 1 0 +
E) 4 2 -1 -

Question 67

The Bohr model predicts that the energy of an atom's electron is ________,meaning that the electron can only occupy orbitals of specific energies.

Question 68

What is the value of the spin quantum number for an electron in a 4p orbital?

A) 4
B) 1
C) either
Or
D)

E)

Question 69

Occupied states or energy levels in the hydrogen atom with n > 1 are called _____ states.

Question 70

The ________ quantum number is given the symbol
.This quantum number is related to the orientation in space of an orbital.

Question 71

A point in a standing wave that has zero amplitude is called a(n)________.

Question 72

The size of an electron orbital is often chosen to be the distance within which 90% of the electron density is found.Why is the orbital radius not chosen to be the distance within which 100% of the electron density is found?

Question 73

Which of the following statements is/are CORRECT?
1)A diamagnetic substance is strongly attracted to a magnetic field.
2)Substances that retain their magnetism after they are withdrawn from a magnetic field are called ferromagnetic.
3)Most transition metals and all lanthanide metals are ferromagnetic.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 3
E) 1,2,and 3