In the β−decay of a radioactive nucleus a neutron is changed into a proton and the mass number is unchanged. Example 88Ra228−β−→89Ac228.
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Q1
When a nucleus, having atomic number Z and mass number A, undergoes a radioactive decay process,
1) Both Z and A will decrease, if the process is α decay.
2.) Z will decrease but A will not change, if the process is β+ decay.
3.) Z will increase but A will not change, if the process is β− decay
4.) Z and A will remain unchanged, if the process is γ decay
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Q2
When a nucleus with atomic number Z and mass number A undergoes a radioactive decay process,
(1) Both Z and A will decrease, if the process is α decay. (2)Z will decrease, but A will not change, if the process is β+ decay. (3)Z will increase, but A will not change, if the process is β− decay. (4)Z and A will remain unchanged, if the process is γ decay.
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Q3
What kind of change takes place in a nucleus when a β-particle is emitted ? Express it by an equation. State whether (a) atomic number and (b) mass number are conserved in a radioactive β-decay ?
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Q4
In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following particles is emitted in the decay?
(a) Proton
(b) Neutron
(c) Electron
(d) Photon
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Q5
In a series of radioactive decays, if a nucleus of mass number 180 and atomic number 72 decays into another nucleus of mass number 172 and atomic number 69, then the number of α and β particles released respectively are