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All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 1020. What is the atomic weight of the unknown element?


A) 32 amu
B) 16 amu
C) 8 amu
D) 4 amu
E) None of these choices are correct.

F) A) and E)
G) B) and D)

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No alpha decay is observed for isotopes of elements with Z < 83.

A) True
B) False

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Select the nuclide that completes the following nuclear reaction. Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.


A) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.
B) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.
C) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.
D) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.
E) None of these choices are correct.

F) A) and B)
G) A) and C)

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An alkaline earth element is radioactive. It and its daughter elements decay by emitting a total of three alpha particles in succession. In what group of the periodic table is the element resulting from the emission of the third alpha particle?


A) 4A (14)
B) 5A (15)
C) 6A (16)
D) 7A (17)
E) 8A (18)

F) A) and B)
G) B) and E)

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The isotopes of promethium, The isotopes of promethium, and <sub> </sub> <sub> </sub>are unstable, and lie on opposite sides of the line of stability . Which of the following combinations is most likely to represent the type of decay for these isotopes? A) promethium-144, β decay; promethium-134, positron decay B) promethium-144, positron decay; promethium-134, β decay C) promethium-144, positron decay; promethium-134, electron capture D) promethium-144, electron capture; promethium-134, positron decay E) promethium-144, β decay; promethium-134, decay and The isotopes of promethium, and <sub> </sub> <sub> </sub>are unstable, and lie on opposite sides of the line of stability . Which of the following combinations is most likely to represent the type of decay for these isotopes? A) promethium-144, β decay; promethium-134, positron decay B) promethium-144, positron decay; promethium-134, β decay C) promethium-144, positron decay; promethium-134, electron capture D) promethium-144, electron capture; promethium-134, positron decay E) promethium-144, β decay; promethium-134, decay are unstable, and lie on opposite sides of the "line of stability". Which of the following combinations is most likely to represent the type of decay for these isotopes?


A) promethium-144, β decay; promethium-134, positron decay
B) promethium-144, positron decay; promethium-134, β decay
C) promethium-144, positron decay; promethium-134, electron capture
D) promethium-144, electron capture; promethium-134, positron decay
E) promethium-144, β decay; promethium-134, The isotopes of promethium, and <sub> </sub> <sub> </sub>are unstable, and lie on opposite sides of the line of stability . Which of the following combinations is most likely to represent the type of decay for these isotopes? A) promethium-144, β decay; promethium-134, positron decay B) promethium-144, positron decay; promethium-134, β decay C) promethium-144, positron decay; promethium-134, electron capture D) promethium-144, electron capture; promethium-134, positron decay E) promethium-144, β decay; promethium-134, decay decay

F) B) and C)
G) A) and E)

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A

Which one of the following equations correctly represents alpha decay of Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E) ?


A) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)
B) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)
C) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)
D) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)
E) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)

F) C) and D)
G) None of the above

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A

The r-process occurs during supernova explosions.

A) True
B) False

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The s-process involves a slow succession of neutron absorption and beta decay processes during the normal life of a star.

A) True
B) False

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Which one of the following equations correctly represents positron decay of Which one of the following equations correctly represents positron decay of ? A) B) C) D) E) ?


A) Which one of the following equations correctly represents positron decay of ? A) B) C) D) E)
B) Which one of the following equations correctly represents positron decay of ? A) B) C) D) E)
C) Which one of the following equations correctly represents positron decay of ? A) B) C) D) E)
D) Which one of the following equations correctly represents positron decay of ? A) B) C) D) E)
E) Which one of the following equations correctly represents positron decay of ? A) B) C) D) E)

F) A) and B)
G) B) and E)

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E

Which of the following isotopes is most likely to be unstable?


A) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
B) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
C) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
D) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
E) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)

F) A) and D)
G) B) and E)

Correct Answer

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Select the nuclide that completes the following nuclear reaction. Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.


A) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.
B) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.
C) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.
D) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E) None of these choices are correct.
E) None of these choices are correct.

F) C) and E)
G) A) and D)

Correct Answer

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A certain isotope has a specific activity of 7.29 × 10-4 Ci/g. How many α particles will a 75.0 mg sample emit in one hour?


A) 9.99 × 104
B) 2.02 × 106
C) 7.28 × 109
D) 1.29 × 1012
E) None of these choices are correct.

F) A) and B)
G) B) and C)

Correct Answer

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The isotope The isotope has a half-life of 7.5 seconds. If a sample contains 144 atoms of approximately how many such atoms were there present 30 seconds earlier? A) 576 B) 1152 C) 2304 D) 4320 E) 4.30 × 10<sup>8</sup> has a half-life of 7.5 seconds. If a sample contains 144 atoms of The isotope has a half-life of 7.5 seconds. If a sample contains 144 atoms of approximately how many such atoms were there present 30 seconds earlier? A) 576 B) 1152 C) 2304 D) 4320 E) 4.30 × 10<sup>8</sup> approximately how many such atoms were there present 30 seconds earlier?


A) 576
B) 1152
C) 2304
D) 4320
E) 4.30 × 108

F) A) and B)
G) B) and D)

Correct Answer

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Gamma rays are high energy electrons.

A) True
B) False

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Cesium-134 is a β emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134 will remain after 10 years?


A) 0.0024 g
B) 0.078 g
C) 0.25 g
D) 0.50 g
E) None of these choices are correct.

F) B) and D)
G) B) and C)

Correct Answer

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After 4 half-lives, the fraction of a radioactive isotope which still remains is approximately one-eighth.

A) True
B) False

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Which of the following isotopes is most likely to be unstable?


A) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
B) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
C) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
D) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
E) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)

F) All of the above
G) A) and C)

Correct Answer

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Select the nuclide that completes the following nuclear reaction. Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)


A) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)
B) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)
C) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)
D) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)
E) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)

F) A) and C)
G) C) and E)

Correct Answer

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The radioisotope The radioisotope will decay through A) α decay. B) β decay. C) positron decay. D) electron capture. E) decay. will decay through


A) α decay.
B) β decay.
C) positron decay.
D) electron capture.
E) The radioisotope will decay through A) α decay. B) β decay. C) positron decay. D) electron capture. E) decay. decay.

F) C) and D)
G) B) and D)

Correct Answer

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Most foodstuffs contain natural, radioactive isotopes.

A) True
B) False

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