Deck 29: Atomic Theory

Question 1

What is the wavelength of the line in the hydrogen spectrum that is comprised of transitions from the n = 5 to the n = 3 levels?

A) 1880 nm
B) 1290 nm
C) 2250 nm
D) 1920 nm

Answer 1

1290 nm

Question 2

The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of the n = 5 state?

A) -0.544 eV
B) 0.378 eV
C) 0.544 eV
D) -0.378 eV

Answer 2

-0.544 eV

Question 3

The four visible colors emitted by hydrogen atoms are produced by electrons:

A) that start in the ground state.
B) that end up in the ground state.
C) that end up in the level with n = 2.
D) that start in the level with n = 2.

Answer 3

that end up in the level with n = 2.

Question 4

The Paschen series of hydrogen corresponds to electron transitions from higher levels to n = 3. What is the longest wavelength in that series? (h = 6.63 * 10^-34 J.s. The ground state of hydrogen is at -13.6 eV.)

A) 822 nm
B) 365 nm
C) 1880 nm
D) 1094 nm

Question 5

If the radius of the electron orbit in the n = 1 level of the hydrogen atoms is 0.0529 nm, what is its radius for the n = 4 level? (Assume the Bohr model is valid).

A) 1.32 nm
B) 0.265 nm
C) 0.106 nm
D) 0.846 nm

Question 6

In the Bohr model of the atom, the orbits where electrons move slowest:

A) have the least radius.
B) have the highest energy.
C) have the least angular momentum.
D) have the lowest energy.

Question 7

The Lyman series of hydrogen is made up of those transitions made from higher levels to n = 1. If the first line (n = 2 to n = 1) in this series has a wavelength of 122 nm, what is the wavelength of the third line (n = 4 to n = 1)?

A) 364 nm
B) 97.6 nm
C) 103 nm
D) 486 nm

Question 8

Of the wavelengths emitted from a hydrogen gas discharge tube, those that are associated with transitions from higher levels down to the n = 1 level produce which of the following?

A) infrared
B) visible
C) ultraviolet
D) mixture of infrared and visible

Question 9

The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1. What is the longest wavelength in that series? (h = 6.63 *10 ^{- 34} J.s. The ground state of hydrogen is at -13.6 eV.)

A) 91.4 nm
B) 273 nm
C) 456 nm
D) 122 nm

Question 10

If a hydrogen atom, originally in its ground state of energy -13.6 eV, absorbs a photon of energy 22.0 eV, what is the resulting kinetic energy of the electron if the proton has negligible kinetic energy?

A)" Such a photon cannot be absorbed in this case."
B) "8.4 eV"
C) "2.4 eV"
D) "16.0 eV"

Question 11

The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of a photon emitted corresponding to a transition from the n = 6 to n = 2 state?

A) 7.9 eV
B) 2.9 eV
C) 3.0 eV
D) 4.0 eV

Question 12

Of the various wavelengths emitted from a hydrogen gas discharge tube, those associated with transitions from higher levels down to the n = 2 level produce which of the following?

A) visible
B) infrared
C) ultraviolet
D) a mixture of visible and ultraviolet

Question 13

When a high voltage is applied to a low-pressure gas causing it to glow, it will emit which type of spectrum?

A) line emission
B) line absorption
C) continuous
D) monochromatic

Question 14

The ionization energy of the hydrogen atom is 13.6 eV. What is the wavelength of a photon having this much energy? (h = 6.63 * 10 ^{- 34} J.s, c = 3.00 *10⁸ m/s, 1 eV = 1.6 *10 ^{- 19} J, and 1 nm = 10 ^{- 9} m)

A) 91.4 nm
B) 360 nm
C) 136 nm
D) 273 nm

Question 15

In contrast to the plum-pudding model of the atom, Rutherford's model:

A) was first to explain atoms emitting discrete frequencies.
B) had the positive charge concentrated in a small region.
C) eliminated radiation from accelerating charges.
D) had the positive charge spread uniformly through the atom.

Question 16

The ionization energy for the hydrogen atom is 13.6 eV. What is the energy of a photon that is emitted as a hydrogen atom makes a transition between the n = 4 and n = 3 states?

A) 3.40 eV
B) 0.66 eV
C) 6.80 eV
D) 2.55 eV

Question 17

When a cool gas is placed between a glowing wire filament source and a diffraction grating, the resultant spectrum from the grating is which one of the following?

A) line emission
B) continuous
C) line absorption
D) monochromatic

Question 18

When a wire carries high current causing it to glow, it will emit which type of spectrum?

A) line absorption
B) monochromatic
C) continuous
D) line emission

Question 19

An alpha particle is:

A) any positively charged nucleus.
B) an X-ray.
C) a neutral helium atom.
D) None of these choices.

Question 20

According to the Rutherford model of the atom, most of the volume of an atom:

A) is empty space.
B) was occupied by the nucleus.
C) excluded electrons.
D) contained positive charges.

Question 21

The quantum mechanical model of the hydrogen atom requires that if the principal quantum number is 5, there will be how many different permitted orbital quantum number(s)?

A) two
B) five
C) one
D) four

Question 22

Characteristic K X-rays are the result of:

A) inner electron transitions.
B) outer electron transitions.
C) nuclear electron states.
D) buckytubes.

Question 23

A muon behaves like an electron except that it has 207 times the mass of the electron. If a muon were bound to a proton, how would the energy levels in the Bohr model compare to those for a bound electron?

A) They would be 207 times as much as those for the electron.
B) They would be (207)² times as much as those for the electron.
C) They would be the same.
D) They would be (1/207) times as much as those for the electron.

Question 24

A photon is emitted from a hydrogen atom that undergoes a transition from n = 3 to n = 2. Calculate the energy and wavelength of the photon. (The ionization energy of hydrogen is 13.6 eV, and h = 6.63 *10^-34 J.s, c = 3.00 * 10⁸ m/s, 1 eV = 1.60 *10^-19 J, and 1 nm = 10^-9 m)

A) 2.21 eV, 563 nm
B) 1.89 eV, 460 nm
C) 2.58 * 10^-19 J, 658 nm
D) 3.02 * 10^-19 J, 658 nm

Question 25

In an analysis relating Bohr's theory to the de Broglie wavelength of electrons, when an electron moves from the n = 1 level to the n = 3 level, the circumference for its orbit becomes 9 times greater. This occurs because:

A) the wavelength of the electron becomes nine times as long.
B) there are triple as many wavelengths, and each wavelength is triple in length.
C) there are nine times as many wavelengths in the new orbit.
D) the electron is moving nine times as fast.

Question 26

When a hydrogen atom absorbs a photon that raises it to the n = 5 state, how many different energies are possible for the photon(s) that may be emitted as the atom eventually returns to the ground state?

A) 5
B) 3
C) 4
D) The correct value is not given.

Question 27

In the n = 5 shell, how many distinct values of are possible?

A) 5
B) 15
C) 10
D) The correct value is not given.

Question 28

When an electron moves from the n = 1 to the n = 3 orbit:

A) the radius doubles and the angular momentum increases by a factor of 9.
B) the radius increases by a factor of 9, and the angular momentum triples.
C) both the radius and the angular momentum increase by a factor of 9.
D) both the radius and the angular momentum triple.

Question 29

The Bohr theory does not predict that:

A) the approximate radius of a hydrogen atom is 5.3 *10^-11 m.
B) hydrogen atoms will give off the lines from the series ending in the n = 2 state.
C) the ground state of hydrogen is spherically symmetric.
D) it requires 13.6 eV to ionize hydrogen.

Question 30

The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 6, there will be how many permitted orbital quantum numbers?

A) 3
B) 16
C) 6
D) 5

Question 31

In the hydrogen atom the potential energy is negative, but the absolute value of the potential energy:

A) is half the kinetic energy of the electron.
B) is equal to n² times the kinetic energy of the electron.
C) is equal to the kinetic energy of the electron.
D) is twice the kinetic energy of the electron.

Question 32

When a hydrogen atom absorbs a photon that raises it to the n = 4 state, what is the least number of photons that can be emitted by that atom as it returns to the ground state?

A) 4
B) 3
C) 5
D) The correct value is not given.

Question 33

The speed of the electron in the Bohr theory of hydrogen is:

A) inversely proportional to n.
B) inversely proportional to n².
C) proportional to n.
D) proportional to n².

Question 34

How many possible substates are available in a hydrogen atom where the principal quantum number is 2?

A) 18
B) 8
C) 36
D) 9

Question 35

The quantum mechanical model of the hydrogen atom requires that if the orbital quantum number = 5, there will be how many permitted orbital magnetic quantum numbers allowed?

A) 7
B) 15
C) 5
D) 11

Question 36

The quantum mechanical model of the hydrogen atom requires that if the orbital quantum number of the hydrogen atom is 3, there will be how many permitted orbital magnetic quantum numbers?

A) three
B) nine
C) four
D) seven

Question 37

The Bohr model of the hydrogen atom accounts for which quantum number?

A) orbital
B) principal
C) orbital magnetic
D) All of the above.

Question 38

The quantum mechanical model of the hydrogen atom requires that if the orbital magnetic quantum number is 4, there will be how many permitted spin magnetic quantum numbers?

A) four
B) seven
C) three
D) two

Question 39

Which of the following transitions in hydrogen from an initial state (n_i) to a final state (n_f) results in the least energy emitted?

A) n_i = 3, n_f = 95
B) n_i = 80, n_f = 2
C) n_i = 2, n_f = 1
D) n_i = 1, n_f = 3

Question 40

A hydrogen atom in the ground state absorbs a 12.75-eV photon. To what level is the electron promoted? (The ionization energy of hydrogen is 13.6 eV).

A) n = 2
B) n = 3
C) n = 5
D) n = 4

Question 41

The quantum mechanical model of the hydrogen atom requires that if the orbital quantum number = 4, there are permitted how many possible substates?

A) 22
B) 18
C) 8
D) 32

Question 42

What is the maximum number of electrons that can occupy a 3d subshell?

A) 5
B) 14
C) 10
D) 18

Question 43

What is the lowest value for n of a shell that can contain a g electron?

A) 5
B) 4
C) 3
D) 6

Question 44

How many electrons are in chlorine's (atomic number 17) next to outer shell (n = 2)?

A) 18
B) 4
C) 2
D) 8

Question 45

The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 3, there will be permitted how many orbital magnetic quantum numbers?

A) 5
B) 8
C) 4
D) 7

Question 46

For n = 5, how many allowed values are possible for the orbital quantum number and the orbital magnetic quantum number?

A) 5, 11
B) 6, 12
C) 5, 9
D) 4, 9

Question 47

The ground state configuration for an element is . What is the atomic number of the element?

A) 11
B) 9
C) 24
D) 13

Question 48

Magnesium has atomic number 12. In its ground state, how many electrons are in its n = 3 shell?

A) 2
B) 8
C) 16
D) 10

Question 49

What is the next energy level that fills after the 4d energy level is full?

A) 5p
B) 4s
C) 6s
D) 4f

Question 50

The ground state electronic configuration for silicon is 1s²2s²2p⁶3s²3p². Which of the following elements would be expected to be chemically similar to silicon?

A) boron with configuration 1s²2s²2p¹
B) lithium with configuration 1s²2s¹
C) carbon with configuration 1s²2s²2p²
D) sodium with configuration 1s²2s²2p⁶3s¹

Question 51

For n = 6, what are the maximum orbital quantum number and the maximum orbital magnetic quantum number?

A) 7, 6
B) 5, 4
C) 6, 5
D) 5, 5

Question 52

The quantum mechanical model of the hydrogen atom suggests a visual picture of the electron as which of the following?

A) planetary orbiting body
B) probability cloud
C) raisin in pudding
D) light quantum

Question 53

If the principal quantum number for hydrogen is 4, which one of the following is not a permitted orbital magnetic quantum number for that atom?

A) "-2"
B) "0"
C) "3"
D) "5"

Question 54

The stimulated emission of photons from the excited atoms in a gas laser is prompted by which of the following?

A) nearby presence of photons of same wavelength as those emitted
B) high flux of electrons
C) high voltage
D) high temperature

Question 55

The red light from a HeNe laboratory laser results from a transition in Ne. Determine the energy difference between the states if the wavelength of the light given off is 634 nm. (h = 6.63 *10^-34 J.s, c = 3.00 *10⁸ m/s, 1 eV = 1.60 *10^-19 J, and 1 nm = 10^-9 m)

A) 2.22 eV
B) 1.43 eV
C) 1.96 eV
D) 2.04 eV

Question 56

The restriction that no more than one electron may occupy a given quantum state in an atom was first stated by which of the following scientists?

A) Bohr
B) Pauli
C) de Broglie
D) Heisenberg

Question 57

For the n = 5 shell, what are the lowest values possible for and respectively?

A) "-5, -5"
B) "-4, -4"
C) "0, -4"
D) "0, 0"

Question 58

The quantum number that can have only two possible values is the:

A) orbital quantum number.
B) principal quantum number.
C) spin magnetic quantum number.
D) orbital magnetic quantum number.

Question 59

The ground state electronic configuration for sodium is 1s²2s²2p⁶3s¹. What is the orbital quantum number of the last (3s¹) electron?

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

Question 60

The ground state electronic configuration for magnesium is 1s²2s²2p⁶3s². Which of the following would most likely result in an element being chemically similar to magnesium?

A) the valence subshell having 2 electrons
B) the valence electron being an s² electron
C) the valence electron being a p² electron
D) the valence electron having principal quantum number 3

Question 61

A ruby laser delivers a 2.28-J pulse in approximately 50 nanoseconds. The wavelength of the light is 694.4 nm. At least how many atoms within the ruby rod had to be excited to allow this high-energy laser pulse? (h = 6.63 *10^-34 J.s, c = 3.00* 10⁸ m/s, 1 eV = 1.6 *10^-19 J, and 1 nm = 10^-9 m)

A) 3 * 10¹⁹
B) 4 * 10¹⁸
C) 8 *10¹⁸
D) 6 * 10²⁰

Question 62

In neon, the 20.66-eV level can undergo lasing action to the 18.70-eV level. What is the energy of the resulting photons?

A) 18.70 eV
B) 20.66 eV
C) 1.96 eV
D) 39.36 eV

Question 63

The wavelength of a coherent laser is 628 nm. What energy difference exists between the upper excited state involved and the lower unexcited ground state? (h = 6.63 *10^-34 J.s, c = 3.00 *10⁸ m/s, 1 eV = 1.60 *10^-19 J, and 1 nm = 10^-9 m)

A) 1.86 eV
B) 1.81 eV
C) 1.75 eV
D) 1.98 eV