The mass number of an element is not changed, when it emits _______________ radiations?
Correct answer: B. β & γ
- A. α & β
- B. β & γ
- C. γ & α
- D. α, β, & γ
Explanation
Beta emission changes a neutron into a proton or vice versa, so the mass number remains unchanged; gamma emission also leaves both mass number and atomic number unchanged. Alpha emission lowers the mass number by four, making β and γ the correct pair.
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