Alpha decay results in a decrease of the atomic number by 2 and the mass number by 4.
When $\alpha$-particle emits from a radioactive element then (1) atomic number decreases by 2 and mass number decreases by 4 (2) atomic number decreases by 1 and mass number decreases by 2 (3) atomic number increases by 1 (4) atomic number and mass number remains same
Asked in MPSC CS Prelims 2023 · Topic: Nuclear Physics (Radioactivity: Alpha, Beta (Fermi theory, selection rules, parity violation), Gamma decay (multipole transitions, internal conversion).)
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Answer: A. atomic number decreases by 2 and mass number decreases by 4
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