Exams › SSC CGL (Prelims) › General

Which nuclear decay alters atomic number but not mass number?

1. Alpha decay
2. Beta decay
3. Gamma decay
4. Fission

Correct answer: Beta decay

Solution

In beta decay, a neutron converts into a proton or a proton converts into a neutron, changing the atomic number. The total number of nucleons remains unchanged, so the mass number does not change.

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