Beta-minus decay
What happens in beta-minus decay?
Answer C: explanation for every choice
A
A proton converting to a neutron and emitting a positron is beta-plus decay.
B
Neutron-to-proton conversion leaves the mass number unchanged.
C
Correct. Z increases by 1 and the mass number is unchanged.
D
Emitting a helium nucleus is alpha decay.
TakeawayBeta-minus: n → p + e⁻ + antineutrino. Z rises by 1, A unchanged.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID cp36.