When a radioactive nucleus emits \(\beta\)–particle, the mass number of the atom:
Question and options
When a radioactive nucleus emits –particle, the mass number of the atom:
- Increases by one
- Decreases by one
- Remains the same
- Decreases by two
Answer and explanation
Correct answer: C - Remains the same
Beta-minus decay converts a neutron into a proton plus an electron (and antineutrino). Atomic number rises by 1 but the total nucleon count, the mass number A, is unchanged.
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