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4 from the alpha. Betas have negligible mass and gammas have no mass.

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βˆ™ 13y ago
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βˆ™ 11y ago

The mass decreases because the particle emits parts of its self away.

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Q: What change in mass occurs when a radioactive atom emits an alpha particle?
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What happens to a radioactive nucleus when it emits alpha particle and What happens to a radioactive nucleus when it emits alpha particle?

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