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Complete Test Bank Essentials of Radiographic Physics and Imaging 3rd Edition Johnston Questions & Answers with rationales (Chapter 1-17)$17.49
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6. The earliest atomic theory based on an arrangement similar to the solar system is attributed to
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a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS: B 44
Rutherford developed the theory that the atom consisted of a very dense nucleus with small electrons
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rotating around, similar to the sun and planets.
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7. The most commonly known modern atomic theory was developed by
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a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS: A 44
Niels Bohr refined Rutherford’s atomic theory, based on the solar system, into the most comm
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only known atomic theory today.
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8. The three fundamental particles of the atom are the
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a. element, nucleus, and electron 4 4 4
b. electron, nucleus, and proton 4 4 4
c. neutron, electron, and proton 4 4 4
d. nucleus, proton, and neutron 4 4 4
ANS: C 44
The three fundamental components of the atom are the proton, electron, and neutron.
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9. The atomic nucleus contains
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a. protons and neutrons 4 4
b. protons and electrons 4 4
c. electrons and neutrons 4 4
d. all of these 4 4
ANS: A 44
The atomic nucleus contains varying amounts of protons and neutrons, depending on the elem
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ent.
10. The component of the nucleus that has a positive charge and mass is the
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a. electron
b. neutron
c. proton
d. none of these 4 4 4
ANS: C 4
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, DOWNLOAD THE Test Bank for Essentials of Radiographic Physics and Imaging
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3rd Edition Johnston 4 4 4
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
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a. electron
b. neutron
c. proton
d. none of these 4 4
ANS: B 44
The neutron is found in the nucleus; it is very similar to the proton but has no electrical charge (
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neutral).
12. The fundamental component of the atom that has the smallest mass is the
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a. electron
b. neutron
c. proton
d. none of these 4 4
ANS: A 44
The electron has significantly less mass than the neutron or proton.
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13. The mass of an atom is primarily due to the mass of the
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a. neutrons
b. nucleus
c. electrons
d. protons
ANS: B 44
The nucleus, consisting of both protons and neutrons, accounts for the majority of the mass of
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an atom.
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14. If an atom has more protons than electrons, it will
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a. have a negative charge 4 4 4
b. have a positive charge 4 4 4
c. be electrically neutral
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d. have neither a positive nor negative charge
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ANS: B 44
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
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a. have a negative charge 4 4 4
b. have a positive charge 4 4 4
c. be electrically neutral
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d. have neither a positive nor negative charge
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ANS: A 44
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 4 4 4
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