This is a stable condition, and there are no more changes in the atomic nucleus.
That chance of decay is very small, but it is always present and it never changes.
In other words, the nuclei do not "wear out" or get "tired".
Some half lives are several billion years long, and others are as short as a ten-thousandth of a second.
Return to top A tasty way for students to understand about half life is to give each team 100 pieces of "regular" M & M candy.
On a piece of notebook paper, each piece should be placed with the printed M facing down. The candy should be poured into a container large enough for them to bounce around freely, it should be shaken thoroughly, then poured back onto the paper so that it is spread out instead of making a pile.