1. Some asteroid fragments end up on the surface of Earth. These fragments can be radioactive. What is the chief cause of radioactivity? Given a radiation detector that can ONLY measure the amount of radiation, how could you determine which type of radiation was being emitted?

2. The isotope lithium-7 has a mass of 7.0160 amu, and the isotope lithium-6 has a mass of 6.0151 amu. 92.58% of all lithium atoms found in nature are lithium-7 and 7.42% are lithium-6. Use this information to calculate the atomic mass of lithium.

3. pick an element from the periodic table. (which one is the easiest element to choose from? I get confused) Define what an isotope is. Describe/detail some isotopes of the element you picked. What specifically makes them the same element? What makes each of these isotopes different from one another?