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Each of these unstable isotopes has its own characteristic half life.

Where the amounts of parent and daughter isotopes can be accurately measured, the ratio can be used to determine how old the rock is, as shown in the following activities.

If you do not see the name or the pictures of the person in question on the black lists, do not assume that it is "safe" to send money to that person.

Scammers change their names and pictures as soon as they learn that those pictures appeared on the black lists.

Some elements have forms (called isotopes) with unstable atomic nuclei that have a tendency to change, or decay.

For example, U-235 is an unstable isotope of uranium that has 92 protons and 143 neutrons in the nucl eus of each atom.

Part 2a Activity — At any moment there is a small chance that each of the nuclei of U-235 will suddenly decay.

That chance of decay is very small, but it is always present and it never changes.

3) To have students see that individual runs of statistical processes are less predictable than the average of many runs (or that runs with relatively small numbers involved are less dependable than runs with many numbers).