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Complete Test Bank Essentials of Radiographic Physics and Imaging 3rd Edition Johnston Questions & Answers with rationales (Chapter 1-17)$17.99
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1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
ing 3rd Edition Johnston 1i 1i 1i
Chapter 02: Structure of the Atom
1i 1i 1i 1i 1i
Johnston/Fauber: Essentials of Radiographic Physics and Imaging, 3rd Edition
1i 1i 1i 1i 1i 1i 1i 1i
MULTIPLE CHOICE 1i
1. The earliest atomic theory is generally associated with
1i 1i 1i 1i 1i 1i 1i
a. Bohr
b. Leucippus
c. Democritus
d. Dalton
ANS: B 1i1i
Although his theory was somewhat vague, Leucippus is most often the earliest person assoc
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
iated with atomic theory. 1i 1i 1i
2. The word atom is derived from the Greek word atomos, meaning
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
a. nuclear
b. small
c. indivisible
d. invisible
ANS: C 1i1i
The Greek word atomos means ―indivisible.‖
1i 1i 1i 1i 1i
3. In the early 1800s English chemist John Dalton theorized that
1i 1i 1i 1i 1i 1i 1i 1i 1i
a. elements form compounds 1i 1i
b. atoms are unique to each element in size and mass
1i 1i 1i 1i 1i 1i 1i 1i 1i
c. a chemical reaction results from atoms being rearranged
1i 1i 1i 1i 1i 1i 1i
d. all of these 1i 1i
ANS: D 1i1i
As a result of his experiments, John Dalton theorized that elements form compounds, atoms
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
are unique to each element in size and mass, and that a chemical reaction results from atom
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
s being rearranged.
1i 1i
4. Discovery of the electron is attributed to 1i 1i 1i 1i 1i 1i
a. Dalton
b. Bohr
c. Thomson
d. Rutherford
ANS: C 1i1i
Joseph John ―J.J.‖ Thomson determined that the electron was a negatively charged part of t
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
he atom. 1i
5. The ―plum pudding model‖ is associated with
1i 1i 1i 1i 1i 1i
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
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1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
ing 3rd Edition Johnston 1i 1i 1i
ANS: D 1i1i
Based on the physical arrangement of raisins in a plum pudding, Thomson described the ato
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
m and surrounding negatively charged particles (electrons).
1i 1i 1i 1i 1i 1i
6. The earliest atomic theory based on an arrangement similar to the solar system is attributed
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1
to i
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS: B 1i1i
Rutherford developed the theory that the atom consisted of a very dense nucleus with small electro
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
ns rotating around, similar to the sun and planets.
1i 1i 1i 1i 1i 1i 1i 1i
7. The most commonly known modern atomic theory was developed by
1i 1i 1i 1i 1i 1i 1i 1i 1i
a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS: A 1i1i
Niels Bohr refined Rutherford’s atomic theory, based on the solar system, into the most co
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
mmonly known atomic theory today.
1i 1i 1i 1i
8. The three fundamental particles of the atom are the
1i 1i 1i 1i 1i 1i 1i 1i
a. element, nucleus, and electron 1i 1i 1i
b. electron, nucleus, and proton 1i 1i 1i
c. neutron, electron, and proton 1i 1i 1i
d. nucleus, proton, and neutron 1i 1i 1i
ANS: C 1i1i
The three fundamental components of the atom are the proton, electron, and neutron.
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
9. The atomic nucleus contains
1i 1i 1i
a. protons and neutrons 1i 1i
b. protons and electrons 1i 1i
c. electrons and neutrons 1i 1i
d. all of these 1i 1i
ANS: A 1i1i
The atomic nucleus contains varying amounts of protons and neutrons, depending on the ele
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
ment.
10. The component of the nucleus that has a positive charge and mass is the
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
a. electron
b. neutron
c. proton
d. none of these 1i 1i 1
ANS: C
i 1 i
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, DOWNLOAD THE Test Bank for Essentials of Radiographic Physics and Imag
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
ing 3rd Edition Johnston 1i 1i 1i
The proton is the part of the nucleus that has a positive charge and mass.
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
11. The component of the nucleus that has mass but no electrical charge is the
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
a. electron
b. neutron
c. proton
d. none of these 1i 1i
ANS: B 1i1i
The neutron is found in the nucleus; it is very similar to the proton but has no electrical char
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
ge (neutral).
1i
12. The fundamental component of the atom that has the smallest mass is the
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
a. electron
b. neutron
c. proton
d. none of these 1i 1i
ANS: A 1i1i
The electron has significantly less mass than the neutron or proton.
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
13. The mass of an atom is primarily due to the mass of the
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
a. neutrons
b. nucleus
c. electrons
d. protons
ANS: B 1i1i
The nucleus, consisting of both protons and neutrons, accounts for the majority of the mass
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
of an atom.
1i 1i
14. If an atom has more protons than electrons, it will
1i 1i 1i 1i 1i 1i 1i 1i 1i
a. have a negative charge 1i 1i 1i
b. have a positive charge 1i 1i 1i
c. be electrically neutral 1i 1i
d. have neither a positive nor negative charge
1i 1i 1i 1i 1i 1i
ANS: B 1i1i
An atom with more protons than electrons will have a positive charge.
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
15. If an atom has more electrons than protons, it will
1i 1i 1i 1i 1i 1i 1i 1i 1i
a. have a negative charge 1i 1i 1i
b. have a positive charge 1i 1i 1i
c. be electrically neutral 1i 1i
d. have neither a positive nor negative charge
1i 1i 1i 1i 1i 1i
ANS: A 1i1i
An atom with more electrons than protons will have a negative charge.
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
16. If an atom has the same number of electrons and protons it will
1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i 1i
a. have a negative charge 1i 1i 1i
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