TIL that Francium is the second rarest naturally occurring element--as little as 20–30 g (1oz) exists at any given time throughout the Earth's crust.
TIL that Francium is the second rarest naturally occurring element--as little as 20–30 g (1oz) exists at any given time throughout the Earth's crust. https://en.wikipedia.org/wiki/Francium slinkslowdown September 01, 2022 at 12:06AM
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