7. Plutonium – $4,000 per gram
Plutonium is the heaviest primordial element, whose half-life of about 80 million years is just long enough for the element to be found in trace quantities in nature.
You’ve probably heard of is, since in every movie the villain seems to want massive quantities of it!
And for good reason that is!
It is used for either military purposes or nuclear reactors.
