What happens to the mass number and atomic number of an ele…

Physics Atomic and Nuclear Physics All Topic Question for Revision Test MCQ (Single Correct)

What happens to the mass number and atomic number of an element when it emits -radiation?

Mass number increases by four and atomic number increases by two.

Mass number decreases by four and atomic number decreases by two.

Mass number and atomic number remain unchanged.

Mass number remains unchanged while atomic number decreases by one.

Text Solution

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The correct answer is:

When an element emits -radiation (gamma rays):

Gamma rays are high-energy photons.

They do not contain protons or neutrons.

Therefore, no change occurs in the number of protons or neutrons.
Conclusion: Both the mass number and atomic number remain unchanged.

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