(a) 2. Rhenium-187 is a radioactive isotope that can be used to determine the age of meteorites. A
0.100 mg sample of Rhenium, Re contains 2.02 x 10' atoms of "Re. What is the percent
abundance of rhenium-187 in the sample?

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

answer; natural resources;