An isotope has a half-life of 30 minutes. Given an original sample of 100 g of the isotope, how much will be left after an hour?

Which of the following statements is NOT true regarding the process of nuclear fusion?

Which of the following has no mass and does not change the composition of the nucleus?

An element undergoes gamma decay to form lead-206. What was the identity of that initial element?

Becky was recently diagnosed with an aggressive brain tumor. Her oncologist recommended treating the tumor with cobalt-60 due to its precision with treating this type of cancer. This substance is being used for _____.

If the amount of Zn-71 was reduced from 50 grams to 12.5 grams in 4 minutes, what is the half-life of Zn-71?

Which of the following types of radioactive decay involves the emission of high-energy electromagnetic radiation?

Which process would turn Rn-218 into Po-214?

During _____ only energy is released.

A sample of thulium-171 has a mass of 0.4055 grams. How much is left after 6 half-lives?

Uranium-238 decays to form thorium-234. Which of the following is this an example of?

When does the atomic number always change?