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What happens to the mass number and atomic number of an element when it emits $\gamma$-radiation?
A
Mass number increases by four and atomic number increases by two.
B
Mass number decreases by four and atomic number decreases by two.
C
Mass number and atomic number remain unchanged.
D
Mass number remains unchanged while atomic number decreases by one.
Detailed Solution
Gamma decay involves the emission of high-energy photons from an excited nucleus, with no change in the number of protons or neutrons — so both mass number and atomic number remain unchanged.