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The "fuel" thats split is usually?

But sometimes is?

The chain reactors:What has to be done to make nuclear fission happen?

What happens when each time a uranium or plutonium nucleus splits up?

When a large atom splits in two it will form?

These new nuclei are usually radioactive because?

A nucleus splitting (called fission) gives out?

More energy than?

Nuclear processes release ?

Thats why nuclear bombs are so much more powerful than?