In a beta decay, the electron and the antineutrino get most energy, leaving a tiny fraction to the nucleus. Additionally, beta decays tend to have less energy (500keV, 1MeV) than alpha (5MeV).
In the alpha decay, the helion gets the energy, and gives a big kick to the remaining nucleus, because an alpha is much heavier than an electron.
A fission is much worse, with a typical energy of 200MeV and fragments weighing like 80 and 140 nucleons.
Then you have the charge unbalance at the remaining atom (or rather ion) which shakes the molecule. A possible scenario is that the fragments recombine to a molecule, often similar to the initial one because these are the available bricks.