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Complete Test Bank Essentials of Radiographic Physics and Imaging 3rd Edition Johnston Questions & Answers with rationales (Chapter 1-17)$12.99
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vi vi vi vi vi vi vi vi vi vi
ing 3rd Edition Johnston vi vi vi
Chapter 02: Structure of the Atom
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Johnston/Fauber: Essentials of Radiographic Physics and Imaging, 3rd Edition
vi vi vi vi vi vi vi vi
MULTIPLE CHOICE vi
1. The earliest atomic theory is generally associated with
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a. Bohr
b. Leucippus
c. Democritus
d. Dalton
ANS: B vivi
Although his theory was somewhat vague, Leucippus is most often the earliest person assoc
vi vi vi vi vi vi vi vi vi vi vi vi vi
iated with atomic theory. vi vi vi
2. The word atom is derived from the Greek word atomos, meaning
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a. nuclear
b. small
c. indivisible
d. invisible
ANS: C vivi
The Greek word atomos means ―indivisible.‖
vi vi vi vi vi
3. In the early 1800s English chemist John Dalton theorized that
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a. elements form compounds vi vi
b. atoms are unique to each element in size and mass
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c. a chemical reaction results from atoms being rearranged
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d. all of these vi vi
ANS: D vivi
As a result of his experiments, John Dalton theorized that elements form compounds, atoms
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are unique to each element in size and mass, and that a chemical reaction results from atom
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s being rearranged.
vi vi
4. Discovery of the electron is attributed to vi vi vi vi vi vi
a. Dalton
b. Bohr
c. Thomson
d. Rutherford
ANS: C vivi
Joseph John ―J.J.‖ Thomson determined that the electron was a negatively charged part of t
vi vi vi vi vi vi vi vi vi vi vi vi vi vi
he atom. vi
5. The ―plum pudding model‖ is associated with
vi vi vi vi vi vi
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
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vi vi vi vi vi vi vi vi vi vi
ing 3rd Edition Johnston vi vi vi
ANS: D vivi
Based on the physical arrangement of raisins in a plum pudding, Thomson described the ato
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m and surrounding negatively charged particles (electrons).
vi vi vi vi vi vi
6. The earliest atomic theory based on an arrangement similar to the solar system is attributed
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to i
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS: B vivi
Rutherford developed the theory that the atom consisted of a very dense nucleus with small electro
vi vi vi vi vi vi vi vi vi vi vi vi vi vi vi
ns rotating around, similar to the sun and planets.
vi vi vi vi vi vi vi vi
7. The most commonly known modern atomic theory was developed by
vi vi vi vi vi vi vi vi vi
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS: A vivi
Niels Bohr refined Rutherford’s atomic theory, based on the solar system, into the most co
vi vi vi vi vi vi vi vi vi vi vi vi vi vi
mmonly known atomic theory today.
vi vi vi vi
8. The three fundamental particles of the atom are the
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a. element, nucleus, and electron vi vi vi
b. electron, nucleus, and proton vi vi vi
c. neutron, electron, and proton vi vi vi
d. nucleus, proton, and neutron vi vi vi
ANS: C vivi
The three fundamental components of the atom are the proton, electron, and neutron.
vi vi vi vi vi vi vi vi vi vi vi vi
9. The atomic nucleus contains
vi vi vi
a. protons and neutrons vi vi
b. protons and electrons vi vi
c. electrons and neutrons vi vi
d. all of these vi vi
ANS: A vivi
The atomic nucleus contains varying amounts of protons and neutrons, depending on the ele
vi vi vi vi vi vi vi vi vi vi vi vi vi
ment.
10. The component of the nucleus that has a positive charge and mass is the
vi vi vi vi vi vi vi vi vi vi vi vi vi
a. electron
b. neutron
c. proton
d. none of these vi vi v
ANS: C
i v i
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, DOWNLOAD THE Test Bank for Essentials of Radiographic Physics and Imag
vi vi vi vi vi vi vi vi vi vi
ing 3rd Edition Johnston vi vi vi
The proton is the part of the nucleus that has a positive charge and mass.
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11. The component of the nucleus that has mass but no electrical charge is the
vi vi vi vi vi vi vi vi vi vi vi vi vi
a. electron
b. neutron
c. proton
d. none of these vi vi
ANS: B vivi
The neutron is found in the nucleus; it is very similar to the proton but has no electrical char
vi vi vi vi vi vi vi vi vi vi vi vi vi vi vi vi vi vi
ge (neutral).
vi
12. The fundamental component of the atom that has the smallest mass is the
vi vi vi vi vi vi vi vi vi vi vi vi
a. electron
b. neutron
c. proton
d. none of these vi vi
ANS: A vivi
The electron has significantly less mass than the neutron or proton.
vi vi vi vi vi vi vi vi vi vi
13. The mass of an atom is primarily due to the mass of the
vi vi vi vi vi vi vi vi vi vi vi vi
a. neutrons
b. nucleus
c. electrons
d. protons
ANS: B vivi
The nucleus, consisting of both protons and neutrons, accounts for the majority of the mass
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of an atom.
vi vi
14. If an atom has more protons than electrons, it will
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a. have a negative charge vi vi vi
b. have a positive charge vi vi vi
c. be electrically neutral vi vi
d. have neither a positive nor negative charge
vi vi vi vi vi vi
ANS: B vivi
An atom with more protons than electrons will have a positive charge.
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15. If an atom has more electrons than protons, it will
vi vi vi vi vi vi vi vi vi
a. have a negative charge vi vi vi
b. have a positive charge vi vi vi
c. be electrically neutral vi vi
d. have neither a positive nor negative charge
vi vi vi vi vi vi
ANS: A vivi
An atom with more electrons than protons will have a negative charge.
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16. If an atom has the same number of electrons and protons it will
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a. have a negative charge vi vi vi
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