A radioactive isotope has an exponential decay as pictured in the above plot of sample amount vs time. From the graph, estimate the half-life of the isotope.

A radioactive isotope has a half-life of days. If a chemist has a sample of , how long will it take until there is of the sample?

What is the cause for radioactive decay?

What kind of radiation has no charge or mass?

What is the relationship between neutrons and protons of nuclides with respect to zone of stability?

Fluorine-18 is a radioactive isotope of fluorine that is used in medical imaging scans. It has a half-life of approximately 110 minutes.

If a patient has a medical imaging scan using an injection of fluorine-18 at 9am, at what time will there be less than 25% of the radioactive isotope in her body?

Technetium-99 is used in hospitals and has a very short half-life of about . If a lab receives of Technetium-99, how much of the sample will remain after ?

Which type of radioactive decay does not emit any physical matter?

The half-life of a certain isotope is 20min. How long will it take for 1g of the isotope to decay to 0.25g?

Which of the following is not a type of nuclear particle involved in radioactive decay?