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What's the rarest and most expensive element on Earth? It's not gold or platinum-it's an element so rare you'll likely never see it, with just one gram worth billions of dollars!
For this radioactive metal, there's less than 28 grams of it on the entire planet at any given moment. It forms naturally as uranium decays but exists for only 22 minutes before breaking down into other elements, making it nearly impossible to collect.
Where can you find it? Technically, in uranium and thorium ores, but harvesting it is nearly impossible because of its short lifespan.
This element is called francium! Discovered in 1939 by Marguerite Perey, a French scientist, francium was the last naturally occurring element to be found. Unfortunately, it isn't useful for much beyond scientific research because it's so unstable and vanishes so quickly.
Francium's rarity and fleeting existence make it one of Earth's most elusive treasures-more valuable than gold but forever out of reach.