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Practice Test #2

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

 1. 

What is the frequency of a photon with a wavelength of 900 nm?
a.
2.33 x 10-15 Hz
c.
3.33 x 1014 Hz
b.
2 x 10-15 Hz
d.
3 x 1014 Hz
 

 2. 

Which of the following rules requires that each of the p orbitals at a particular energy level receive one electron before any of them can have two electrons?
a.
Hund's rule
c.
the Aufbau principle
b.
the Pauli exclusion principle
d.
the quantum rule
 

 3. 

What is the total number of electrons needed to fill the first two main energy levels?
a.
2
c.
10
b.
6
d.
18
 

 4. 

What is the energy of a single photon whose frequency is 5.00 x 1012 Hz?
a.
4.53 x 1045 J
c.
3.31 x 10-21 J
b.
4.53 x 1045 kJ
d.
3.31 x 10-21 kJ
 

 5. 

The nucleus of an atom has all of the following characteristics EXCEPT that it
a.
is positively charged.
c.
contains nearly all of the atom's mass.
b.
is very dense.
d.
contains nearly all of the atom's volume.
 

 6. 

With the quantum model of the atom, scientists have come to believe that determining an electron's exact location around the nucleus
a.
is impossible.
b.
can be done before 2005.
c.
can be done easily.
d.
can be done only with specialized equipment.
 

 7. 

The electron notation for aluminum (atomic number 13) is
a.
1s2 2s2 2p3 3s2 3p3 3d1.
c.
1s2 2s2 2p6 3s2 3p1.
b.
1s2 2s2 2p6 3s2 2d1.
d.
1s2 2s2 2p9.
 

 8. 

What is the energy for a single photon of light with a wavelength of 8.00 x 10-7 m?
a.
4.29 x 1014 J
c.
2.48 x 10-19 J
b.
6.47 x 1047 J
d.
1.71 x 105 kJ
 

 9. 

Helium-4 and helium-3 are
a.
isotopes.
c.
compounds.
b.
different elements.
d.
nuclei.
 

 10. 

The total number of orbitals that can exist at the second principle energy level is
a.
2.
c.
4.
b.
3.
d.
8.
 

 11. 

If electromagnetic radiation A has a lower frequency than electromagnetic radiation B, then compared to B the wavelength of A is
a.
longer.
b.
shorter.
c.
equal.
d.
exactly half the length of B's wavelength.
 

 12. 

In SI, the frequency of electromagnetic radiation is measured in
a.
nanometers.
c.
hertz.
b.
quanta.
d.
joules.
 

 13. 

How many electrons can occupy the s orbitals at each energy level?
a.
two, if they have opposite spins
c.
one
b.
two, if they have the same spin
d.
no more than eight
 

 14. 

The energy of a photon, or quantum, is related to its
a.
mass.
c.
frequency.
b.
speed.
d.
size.
 

 15. 

Isotopes of each element differ in
a.
the number of neutrons in the nucleus.
b.
atomic number.
c.
the number of electrons in the highest energy level.
d.
the total number of electrons.
 

 16. 

The expected electron shell configuration for Niobium using the noble gas core short-cut method is:
a.
[Ar] 4s2 4d 3
c.
[Kr] 5s2 5d 3
b.
[Xe] 5s2 4d 3
d.
[Kr] 5s2 4d 3
 

 17. 

The element with electron configuration 1s2 2s2 2p6 3s2 3p2 is
a.
Mg (Z = 12).
c.
S (Z = 16).
b.
C (Z = 6).
d.
Si (Z = 14).
 

 18. 

If 8 electrons completely fill a main energy level, what is n?
a.
2
c.
8
b.
4
d.
32
 

 19. 

How many electrons are needed to completely fill the fourth energy level?
a.
8
c.
32
b.
18
d.
40
 

 20. 

The number of electrons in the highest energy level of the argon atom (atomic number 18) is
a.
10.
c.
6.
b.
2.
d.
8.
 

 21. 

As the atomic number increases, the number of electrons in an atom
a.
decreases.
c.
remains the same.
b.
increases.
d.
is undetermined.
 

 22. 

If electrons in an atom have the lowest possible energies, the atom is in the
a.
ground state.
c.
excited state.
b.
inert state.
d.
radiation-emitting state.
 

 23. 

For electromagnetic radiation, c (the speed of light) equals
a.
frequency minus wavelength.
c.
frequency divided by wavelength.
b.
frequency plus wavelength.
d.
frequency times wavelength.
 

 24. 

According to the Bohr model of the atom, the single electron of a hydrogen atom circles the nucleus
a.
in specific, allowed orbits.
b.
in one fixed orbit at all times.
c.
at any of an infinite number of distances, depending on its energy.
d.
counterclockwise.
 

 25. 

A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
a.
nuclide.
c.
electron.
b.
neutron.
d.
isotope.
 

 26. 

Bohr's theory helped explain why
a.
electrons have negative charge.
b.
most of the mass of the atom is in the nucleus.
c.
excited hydrogen gas gives off certain colors of light.
d.
atoms combine to form molecules.
 

 27. 

As the mass number of the isotopes of an element increases, the number of protons
a.
decreases.
b.
increases.
c.
remains the same.
d.
doubles each time the mass number increases.
 

 28. 

What is the energy of mole of photons with a frequency of 5.75 x 1013 Hz?
a.
22936 J
c.
2.294 x 104 J
b.
22900 J
d.
23000 J
 

 29. 

Visible light, X rays, infrared radiation, and radio waves all have the same
a.
energy.
c.
speed.
b.
wavelength.
d.
frequency.
 

 30. 

The speed of an electromagnetic wave is equal to the product of its wavelength and its
a.
mass.
c.
velocity.
b.
color.
d.
frequency.
 

 31. 

The change of an atom from an excited state to the ground state always requires
a.
absorption of energy.
c.
release of visible light.
b.
emission of electromagnetic radiation.
d.
an increase in electron energy.
 

 32. 

The distance between two successive peaks on a wave is its
a.
frequency.
c.
quantum number.
b.
wavelength.
d.
velocity.
 

 33. 

If the third main energy level contains 15 electrons, how many more could it possibly hold?
a.
0
c.
3
b.
1
d.
17
 

 34. 

The letter designations for the first four sublevels with the number of electrons that can be accommodated in each sublevel are
a.
s:1, p:3, d:10, and f:14.
c.
s:2, p:6, d:10, and f:14.
b.
s:1, p:3, d:5, and f:7.
d.
s:1, p:2, d:3, and f:4.
 

 35. 

The atomic sublevel with the next highest energy after 4p is
a.
4d.
c.
5p.
b.
4f.
d.
5s.
 

 36. 

An atom is electrically neutral because
a.
neutrons balance the protons and electrons.
b.
nuclear forces stabilize the charges.
c.
the numbers of protons and electrons are equal.
d.
the numbers of protons and neutrons are equal.
 

 37. 

Isotopes are atoms of the same element that have different
a.
principal chemical properties.
c.
numbers of protons.
b.
masses.
d.
numbers of electrons.
 

 38. 

The mass of a neutron is
a.
about the same as that of a proton.
c.
double that of a proton.
b.
about the same as that of an electron.
d.
double that of an electron.
 

 39. 

All of the following describe the Heisenberg uncertainly principle EXCEPT
a.
it states that it is impossible to determine simultaneously both the position and velocity of an electron or any other particle.
b.
it is one of the fundamental principles of our present understanding of light and matter.
c.
it helped lay the foundation for the modern quantum theory.
d.
it helps to locate an electron in an atom.
 

 40. 

If a principle energy level can hold 18 electrons. Which one is it?
a.
1st
c.
6th
b.
3rd
d.
18th
 

 41. 

For an electron in an atom to change from the ground state to an excited state,
a.
energy must be released.
b.
energy must be absorbed.
c.
radiation must be emitted.
d.
the electron must make a transition from a higher to a lower energy level.
 

 42. 

One of the wave properties of electromagnetic radiation, such as light, is
a.
volume.
c.
mass.
b.
frequency.
d.
weight.
 

 43. 

What is the electron configuration for nitrogen, atomic number 7?
a.
1s2 2s2 2p3
c.
1s2 2s3 2p1
b.
1s2 2s3 2p2
d.
1s2 2s2 2p2 3s1
 

 44. 

How many orbitals can exist at the third main energy level?
a.
3
c.
9
b.
6
d.
18
 

 45. 

For the f sublevel, the number of orbitals is
a.
5.
c.
9.
b.
7.
d.
18.
 

 46. 

How many electrons are needed to fill the third main energy level if it already contains 8 electrons?
a.
0
c.
10
b.
8
d.
22
 

 47. 

In the electron configuration for scandium (atomic number 21), what is the notation for the three highest-energy electrons?
a.
3d1 4s2
c.
3d3
b.
4s3
d.
4s2 4p1
 

 48. 

Atoms of the same element that have different masses are called
a.
moles.
c.
nuclides.
b.
isotopes.
d.
neutrons.
 

 49. 

Most of the volume of an atom is occupied by the
a.
nucleus.
c.
electron cloud.
b.
nuclides.
d.
protons.
 

 50. 

The major difference between a 1s orbital and a 2s orbital is that
a.
the 2s orbital can hold more electrons.
b.
the 2s orbital has a slightly different shape.
c.
the 2s orbital is at a higher energy level.
d.
the 1s orbital can have only one electron.
 

 51. 

The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the
a.
electron.
c.
neutron.
b.
proton.
d.
atom.
 

 52. 

Because c, the speed of electromagnetic radiation, is a constant, the wavelength of the radiation is
a.
proportional to its frequency.
c.
inversely proportional to its frequency.
b.
equal to its frequency.
d.
double its frequency.
 

 53. 

The product of the frequency and the wavelength of a wave equals the
a.
number of waves passing a  point in a second.
b.
speed of the wave.
c.
distance between wave crests.
d.
time for one full wave to pass.
 

 54. 

The total number of protons and neutrons in the nucleus of an atom is its
a.
atomic number.
c.
mass number.
b.
Avogadro constant.
d.
number of neutrons.
 

 55. 

The number of orbitals for the d sublevel is
a.
1.
c.
5.
b.
3.
d.
7.
 

 56. 

The atomic number of oxygen, 8, indicates that there are eight
a.
protons in the nucleus of an oxygen atom.
b.
oxygen nuclides.
c.
neutrons outside the oxygen atom's nucleus.
d.
energy levels in the oxygen atom's nucleus.
 

 57. 

The nucleus of most atoms is composed of
a.
tightly packed protons.
c.
tightly packed protons and neutrons.
b.
tightly packed neutrons.
d.
loosely connected protons and electrons.
 

 58. 

A single orbital in the 3d level can hold ____ electrons.
a.
10
c.
3
b.
2
d.
6
 

 59. 

A purple light has a frequency of 8.42 x 1014 Hz. What is its wavelength in nanometers (nm)?
a.
2.47 x 106 nm
c.
356 nm
b.
2.5 x 106 nm
d.
400 nm
 

 60. 

What is the wavelength of radiation whose frequency is 2.50 x 1014 Hz?
a.
1.20 x 10-6 m
c.
5.00 x 105 m
b.
4.50 x 1031 m
d.
3.00 x 108 m
 

 61. 

What element is most likely to have the electron shell configuration: [Xe] 6s2 4f 5
a.
Iridium
c.
Blasium
b.
Promethium
d.
Bohrium
 

 62. 

A line spectrum is produced when an electron moves from one energy level
a.
to a higher energy level.
b.
to a lower energy level.
c.
into the nucleus.
d.
to another position in the same sublevel.
 

 63. 

The part of the atom where the electrons CANNOT be found is the
a.
area surrounding the nucleus.
c.
electron cloud.
b.
nucleus.
d.
orbitals.
 

 64. 

Isotopes of an element contain different numbers of
a.
electrons.
c.
neutrons.
b.
protons.
d.
nuclides.
 

 65. 

Which of the following is the correct electron shell configuration for Chromium?
a.
[Ar] 4s13d5
c.
[Kr]4s13d5
b.
[Ar] 4s23d4
d.
[Kr]4s23d4
 

 66. 

Planck's constant
a.
depends on the frequency of the radiation.
b.
depends on the mass of the radiation.
c.
depends on the wavelength of the radiation.
d.
is the same for all forms of radiation.
 

 67. 

The electron configuration for the carbon atom (C) is 1s2 2s2 2p2. The atomic number of carbon is
a.
3.
c.
11.
b.
6.
d.
12.
 

 68. 

Unlike in an orbit, in an orbital
a.
an electron's position cannot be known precisely.
b.
an electron has no energy.
c.
electrons cannot be found.
d.
protons cannot be found.
 



 
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