This is a set of questions that goes with the article titled "62 Endangered Elements" by Chris Patrick. The article itself is not included, and is available in the February 2017 issues of ChemMatters magazine, or online to teachers who are members of the American Association of Chemistry Teachers.
This can be used as a homework assignment, classwork (great for any chemistry or physical science class when there's a substitute), or a precursor to an essay assignment about endangered elements, which is how I use it.
Endangered elements are a simple and timely topic for any science class, especially chemistry, environmental, or physical science. Students are often intrigued and surprised by the fact that reserves of these resources are running out, and it's a good opportunity to clarify understanding of the Law of Conservation of Matter. The best part? This can be added pretty much anywhere in the curriculum!