4 from the alpha. Betas have negligible mass and gammas have no mass.
The mass decreases because the particle emits parts of its self away.
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An alpha particle
alpha particle, He nucleus
an alpha particle
An alpha particle, one of the possible emissions in radioactive decay.
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alpha particle
An alpha particle itself is not radioactive, but it is the result of a type of radioactive decay called (obviously) alpha decay. The alpha particle is actually a helium-4 nucleus, and it will eventually pick up a pair of electrons and become an atom of that inert or noble gas.
alpha particle
An alpha particle
An alpha particle has two protons.
This is a alpha particle.
alpha particle beta particle gamma rays
Gamma.
An alpha particle
alpha particle, He nucleus
Alpha particle.