Mystery #2Tier 3wobbly atomic cores
Why are some atoms perfectly steady while others slowly fall apart?
Most atoms sit quietly for ever and never change. But a few, like certain kinds of uranium, slowly break themselves apart, giving off energy as they go. Same sort of building blocks, wildly different behaviour. So why are some atoms rock-steady while others just cannot keep still?
Your guess
Some atoms stay steady for ever and others fall apart. What do you think makes the difference between a calm atom and a restless one?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.