If during a radioactive nucleus decay, the atomic number reduces by two and the mass number by four, then the emission is known as:

1. α-emission
2. β-emission
3. γemission
4. none of these
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Answer: A
Explanation:
• N/A
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An alpha particle contains:

1. two protons only
2. two protons and two neutrons
3. one proton and one neutron
4. two protons and two electrons
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Answer: B
Explanation:
• Alpha particles are Helium nuclei with mass number of 4 amu and charge of +2.
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What type of decay might convert Th-230 to Ra-226?

1. α-emission
2. β-emission
3. γemission
4. none of these
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Answer: A
Explanation:
• An alpha emission reduces the atomic number by 2 and mass number by 4.
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A free β-particle does not exist as such in the nucleus rather at the time of emission, it is produced by:

1. the conversion of a proton to a neutron
2. the emission of a free electron
3. the conversion of a neutron to a proton
4. none of these
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Answer: C
Explanation:
• A free neutron decays into a proton, electron and a neutrino.
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A β-emission results in:

1. increase of atomic mass by one
2. decrease of atomic number by one
3. decrease of mass number by one
4. increase of one positive charge on nucleus
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Answer: D
Explanation:
• A β-emission increases atomic number by one with no change in mass number.
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A β-emission results in the production of an:

1. isotope
2. isobar
3. isotone
4. none of these
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Answer: B
Explanation:
• Isobars have same mass number but different atomic number.
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one α-emission followed by two β-emissions yields an:

1. isotope
2. isobar
3. isotone
4. none of these
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Answer: A
Explanation:
• one alpha emission decreases atomic number by two and two β-emissions then increase atomic number by two.
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There are ------- chief types of radioactive decay.

1. 2
2. 3
3. 4
4. 5
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Answer: A
Explanation:
• α-decay and β-decay
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Which of the following emissions does not change the atomic number?

1. α-emission
2. β-emission
3. γemission
4. none of these
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Answer: C
Explanation:
• N/A
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In an α-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: B
Explanation:
• Since during an alpha emission, the atomic number decreases by two.
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