Physics for IGCSE & O level - Atoms And Radioactivity (Section 3 - No. 10)
What happens during alpha decay?
The atomic number decreases by 2.
The mass number decreases by 4.
A beta particle is emitted
The nucleus gains a proton.
Explanation
During alpha decay, the atomic number decreases by 2, and the mass number decreases by 4.
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