Imagine atoms as coil springs that are tightly compressed with rubber bands wound around them. If the rubber band gets cut, the spring will rapidly release all of the stored energy in it. If it’s just a single spring by itself, not a big deal, but if the spring is in a big pile of springs like it, and when it suddenly decompresses it cuts the rubber bands on a few nearby springs and they do the same to their neighbors, you can imagine the chaos that ensues – a chanin reaction / explosion.
Radioactive elements have atoms like large springs with rubber bands just barely big enough to keep them compressed – it doesn’t take much to set them off. Stable atoms have rubber bands that are quite a bit stronger than the spring itself.
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