During radioactive decay the nucleus releases particles.Why these particles don't collide with electrons?Or if they collide what is the result of this collision?
They do collide. But, the emitted alpha particle carries much more energy than the binding energy of the electron in a helium atom or H e X + ion. Therefore such a collision scatters the electrons (which carry away some of the original energy of the alpha particle) instead of forming an atom.
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HOPE THIS HELPS....
(YOU CAN CROSSCHECK FROM GOOGLE ALSO)