Physics for IGCSE & O level - Atoms And Radioactivity (Section 1 - No. 37)

What happens to the atomic number and the mass number during Beta-minus decay?
Atomic number increases by 1; Mass number remains the same
Atomic number decreases by 1; Mass number remains the same
Atomic number remains the same; Mass number decreases by 4
Atomic number decreases by 2; Mass number decreases by 4

Explanation

In beta-minus decay, a neutron decays into a proton which increases the atomic number by one, and the mass number remains the same.

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