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FINAL EOC REVIEW – SHEET 1
1. The characteristic bright-line spectrum of an element
is produced when electrons
a. fall back to lower energy levels
b. are gained by a neutral atom
c. are emitted by the nucleus as beta particles
d. move to higher energy levels
2. Compared with an atom of C-12, an atom of C-14 has
a. More protons
b. Fewer protons
c. More neutrons
d. Fewer neutrons
3. How many electrons are present in the electron-dot
diagram of an atom with atomic number 9?
a. 2
b. 7
c. 9
d. 11
4. If atom X is represented by 126X and atom Y is
represented by 146Y, then X and Y are:
a. isotopes of the same element
b. isotopes of different elements
c. ions of the same element
d. ions of different elements
5. When an atom goes from the excited state to the
ground state, the total energy of the atom
a. Decreases
b. Increases
c. remains the same
6. Which of the following represents the electron
configuration of an atom in the excited state?
a. 1 – 1
b. 2 – 8
c. 2 - 8 – 2
d. 2 - 8 – 18
7. A sample of element X contains 90% 35X atoms, 8%
37
X atoms, and 2% 38X atoms. The weighted -atomic
average mass is closest to
a. 32
b. 35
c. 37
d. 38
8. The atomic number of an atom is always equal to the
number of
a. neutrons in the nucleus
b. protons in the nucleus
c. neutrons plus protons in the atom
d. protons plus electrons in the atom
9. What is the number of electrons in an atom with an
atomic number of 13 and a mass number of 27?
a. 13
b. 14
c. 27
d. 40
10. Which two particles have approximately the same
mass?
a. neutron and electron
b. neutrons and deuteron
c. proton and neutron
d. proton and electron
11. The mass number of an atom is equal to the number
of
a. neutrons, only
b. protons, only
c. neutrons plus protons
d. electrons plus protons
12. An atom of 22688Rn contains:
a. 88 protons and 138 neutrons
b. 88 protons and 138 electrons
c. 88 electrons and 226 neutrons
d. 88 electrons and 226 protons
13. Which is the best description of an orbital as used in
the wave-mechanical model of an atom?
a. trajectory of shared electrons
b. plot of probability of electron location
c. path of travel of electrons around the
nucleus
d. simplest component of the emission
spectrum
14. Which scientist played the greatest role in the
development of the model of the atom?
a. J. Willard Gibbs
b. Stephen Jay Gould
c. Throckmorton P. Guildersleeve
d. Ernest B. Rutherford
15. Which numbered arrow in the diagram below gives
the best indicator of the time at which the particle
model of the atom became generally accepted by
chemists and physicists?
16. In the particle model of the atom, which nuclei of
atoms are surrounded by negatively charged
electrons?
a. all nuclei
b. only nuclei with more electrons than protons
c. only nuclei with more neutrons than protons
d. only nuclei with the same number of protons
as neutrons
17. How is an atom of 3919K different from an atom of
40
18Ar?
a. The K atom has fewer electrons.
b. The K atom has fewer protons.
c. The K atom has fewer neutrons.
d. The K atom has a greater neutron/proton
ratio.
18. Which property accounts for the fact that atoms can
be identified by examination of an emission
spectrum?
a. Each kind of atom has a different atomic
number.
b. Each kind of atom has a different mass
number.
c. Each kind of atom has a characteristic
difference in atomic radius.
d. Each kind of atom has a characteristic
difference in energy levels for electrons
19. Which property is most closely related to similarity in
chemical properties of the elements?
a. number of neutrons
b. number of protons
c. number of valence electrons
d. number of occupied energy levels
FINAL EOC REVIEW – SHEET 1
26. What is the maximum number of electrons that can
occupy the second principal energy level?
a. 6
b. 8
c. 18
d. 32
27. Which principal energy level can hold a maximum of
18 electrons?
a. 5
b. 2
c. 3
d. 4
28. Which is the correct electron dot representation of an
atom of sulfur in the ground state?
20. Which phenomenon is best represented by this
diagram?
a. gain of energy as seen in an emission
spectrum
b. loss of energy as seen in an emission
spectrum
c. gain of energy as seen in an absorption
spectrum
d. loss of energy as seen in an absorption
spectrum
21. Which lists the three major subatomic particles in
order of increasing mass?
a. electron, proton, neutron
b. electron, neutron, proton
c. neutron, electron, proton
d. proton, neutron, electron
22. When these four components of the electromagnetic
spectrum (listed in alphabetical order) are listed in
order of increasing energy, which occupies the third
position? infrared, microwaves, ultraviolet, and visible
a. Infrared
b. Microwaves
c. Ultraviolet
d. Visible
23. When these four components of the electromagnetic
spectrum (listed in alphabetical order) are listed in
order of increasing wavelength, which occupies the
third position? infrared, visible, ultraviolet, and X rays
a. Infrared
b. Visible
c. Ultraviolet
d. X-rays
24. Which is the best definition of valence electrons?
a. electrons lost by an atom during a chemical
reaction
b. electrons gained by an atom during a
chemical reaction
c. electrons found in the outer energy level of a
ground state atom
d. electrons found in the outer energy level of
an excited state atom
25. The weighted-average atomic mass for bromine as
reported on the Periodic Table is 79.9. There are two
naturally occurring isotopes of bromine. The isotope,
bromine-79, accounts for about 51% of naturally
occurring bromine. Which isotope accounts for the
other 49%?
a. bromine-80
b. bromine-81
c. bromine-82
d. bromine-83
a.
S:
b.
S:
c.
:S:
d.
:S:
29. The total number of d-orbitals in the 3rd principal
energy level is
a. 1
b. 5
c. 3
d. 7
30. The “kernel” usually includes all parts of the atom
except:
a. Neutrons
b. Protons
c. Valence electrons
d. Orbital electrons
31. The amount of energy required to remove the most
loosely bound electron from an atom in the gaseous
phase is called:
a. Kinetic energy
b. Potential energy
c. Ionization energy
d. Electron affinity
32. What is the maximum number of sublevels in the
third principal energy level?
a. 1
b. 2
c. 3
d. 4
33. The number of valence electrons in an atom with an
electron configuration of 1s22s22p63s23p4 is
a. 6
b. 2
c. 16
d. 4
34. Which diagram correctly represents an atom of
fluorine in an excited state?
35. In an atom, the s sublevel has
a. 1 orbital
b. 5 orbitals
c. 3 orbitals
d. 7 orbitals
36. What is the maximum number of electrons that can
occupy an orbital?
a. 1
b. 2
c. 3
d. 6
37. Which electron configuration represents three halffilled orbitals?
a.
b.
c.
d.
1s22s22p6
1s22s22p5
1s22s22p3
1s22s22p4