Some isotopes are ____, so they will ____ (are radioactive). This means that they will give out ____ (such as a beta or ____ particle) and will change into a ____ isotope. The ____ of radiation given out per second is called the ____. For a sample of the ____ isotope, the activity will ____ over time. This is because once an atom has decayed once, it ____ do it again as it is something new. Scientists can't tell when one particular ____ will decay because decay is ____, but they can see an overall ____. This is called the half-life.

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