2. Californium - about 27 million USD/gram
Californium (CF) is an extremely radioactive synthetic metal, created for the first and only time on March 17, 1950. CF is used to activate nuclear reactors, treat cancer, take X-rays, exploit oil and gas, and produce explosives. However, because it is a strong radioactive substance, direct contact or improper use of CF will harm the genome of all living organisms, including humans. Causes cancer, damage to the immune system, deformities, and radiation is also passed on to future generations
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