TESTBANK FOR Essentials of Radiographic Physics and Imaging 3rd Edition by James Johnston , Terri L. Fauber ISBN:% COMPLETE GUIDE FOR A+ GRADE!!! ALL CHAPTERS COVERED!!

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Chapter 02: Structure of the Atom
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MULTIPLE CHOICE rq




1. The earliest atomic theory is generally associated with
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a. Bohr
b. Leucippus
c. Democritus
d. Dalton
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Although his theory was somewhat vague, Leucippus is most often the earliest person associ at
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ed with atomic theory.
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2. The word atom is derived from the Greek word atomos, meaning
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a. nuclear
b. small
c. indivisible
d. invisible
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The Greek word atomos means “indivisible.”
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3. Inthe early 1800s English chemist John Dalton theorized that
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a. elements formcompounds rq rq



b. atoms are unique to each element in size and mass rq rq rq rq rq rq rq rq rq



c. a chemical reaction results from atoms being rearranged
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d. all of these ai rq




ANS: D r q r q



As a result of his experiments, John Dalton theorized that elements form compounds, atoms ar
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e unique to each element in size and mass, and that a chemical reaction results from atoms bein
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g rearranged.
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4. Discoveryof the electron is attributed to rq rq airq airq rq rq



a. Dalton
b. Bohr
c. Thomson
d. Rutherford
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Joseph John “J.J.” Thomson determined that the electron was a negatively charged part of th e
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atom.

5. The “plum pudding model” is associated with
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a. Bohr
b. Rutherford
c. Dalton
d. Thomson



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,DOWNLOADTHETestBankforEssentialsofRadiographicPhysicsandImag ing 3r
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d Edition Johnston rq rq




ANS: D r q r q



Based on the physical arrangementof raisins in a plum pudding, Thomson described the ato m
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and surrounding negatively charged particles (electrons).
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6. The earliest atomic theorybased on an arrangement similar to the solar system is attributed t o
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a. Bohr
b. Rutherford
c. Dalton
d. Thomson
ANS: B r q r q



Rutherford developed the theory that the atom consisted of a verydense nucleus withsmall electro ns ro
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tating around, similar to the sun and planets.
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7. The mostcommonlyknown modern atomic theory was developed by
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a. Bohr
b. Rutherford
c. Dalton
d. Thomson
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Niels Bohr refined Rutherford’s atomic theory, based on the solar system, into the most com mo
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nly 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 rq rq rq



b. electron, nucleus, and proton rq rq rq



c. neutron, electron, and proton rq rq rq



d. nucleus, proton, and neutron rq rq rq




ANS: C r q r q



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 rq rq



b. protons and electrons rq rq



c. electronsand neutrons rq rq



d. all of these ai rq




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The atomic nucleus contains varying amounts of protons and neutrons, depending on the ele
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ment.

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. noneof these ai




ANS: C
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d Edition Johnston rq rq



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 ofthese rq




ANS: B r q r q



The neutron is found in the nucleus; it is very similar to the protonbut has no electrical char ge (n
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eutral).

12. The fundamentalcomponent of the atom that has the smallest mass is the
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a. electron
b. neutron
c. proton
d. none of these rq ai




ANS: A r q r q



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 r q r q



The nucleus, consisting of bothprotons and neutrons, accounts for the majorityof the mass ofan
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atom.
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14. Ifan atom has more protons thanelectrons, it will
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a. have a negative charge rq rq rq



b. have a positive charge rq rq rq



c. be electrically neutral rq rq



d. have neither a positive nor negative charge
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ANS: B r q r q



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 rq rq rq



b. have a positive charge rq rq rq



c. be electrically neutral rq rq



d. have neither a positive nor negative charge
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ANS: A r q r q



An atom with more electrons than protons will have a negative charge.
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16. Ifan atom has the same number ofelectrons and protons it will
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a. have a negative charge rq rq rq




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