This is one of the questions which seems hard but the answer is surprisingly simple. An atomic nucleus is really just a bunch of little balls stuck together. If you hit it with another ball fast enough, it breaks the others apart. Uranium or Plutonium are used because their nuclei are so large that they sometimes break apart spontaneously, so it doesn’t take much to knock them apart deliberately. And when they break apart, they spit out some more balls which smack into their nearby neighbors and so on. That’s why we call it a “chain reaction” – one atom splits which triggers the next one and the next one in a chain.
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