Since one gramme of francium has never been observed, the billion per gramme is purely. Feb 16, 2024 · here is a list of the 10 most expensive elements on this planet. Jul 12, 2023 · 1. You might ask how could such an element be so expensive. Sep 1, 2005 · yes, it is true that francium is one of the rarest elements on earth.
This is because francium is.
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