In β-emission, the parent atom will be displaced to a group (in the periodic table):

1. two places to the right
2. two places to the left
3. one place to the left
4. one place to the right
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Answer: D
Explanation:
• During β-emission, the atomic number increases by one.
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In an α-emission, the parent atom will be displaced to a group two places to the right while in a β-emission, it will be displaced one place to the right. This is called:

1. The group displacement Law
2. Disintegration law
3. Henry's Law
4. none of these
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Answer: A
Explanation:
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In 1913, the Group displacement Law was given by:

1. Soddy
2. Henri Becquerel
3. Fajans and Soddy
4. Marie Curie
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Answer: C
Explanation:
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A radioactive element disintegrates to form a new daughter element. The process of disintegration and formation of new elements continues till:

1. few α or β-emissions
2. infinite α or β-emissions
3. maximum of 10 α or β-emissions
4. a non-radioactive stable element is the product
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Answer: D
Explanation:
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The whole series of elements starting from the parent radioactive element to the stable end-product is known as:

1. radioactive disintegration series
2. radioactive decay series
3. radioactive series
4. all of these
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Answer: D
Explanation:
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All the natural radioactive elements have the radioactive series:

1. 2
2. 3
3. 5
4. 8
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Answer: B
Explanation:
• The uranium series, Thorium series and Actinium series.
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The uranium series starts with uranium-238 and terminates with the stable element:

1. lead-206
2. Radon-222
3. lead-207
4. polonium-210
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Answer: A
Explanation:
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The thorium series commences with thorium-232 and ends with the stable element:

1. lead-207
2. thorium-233
3. lead-208
4. Bismuth-210
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Answer: C
Explanation:
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The actinium series begins with the radioactive element:

1. Actinium-227
2. uranium-235
3. protectinium-231
4. Radium-223
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Answer: B
Explanation:
• The Actinium series starts from U-235 and Ac-227 is its prominent member.
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The actinium series ends with the stable element:

1. lead-207
2. thorium-233
3. lead-210
4. Bismuth-210
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Answer: A
Explanation:
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