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Which is the rarest element on earth?

Question asked by: knowitall

The element astatine is the rarest element in the Earth's
crust, with around 25 g (0.9 oz) in total occurring naturally.

By: Unknown
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But, there is a keen competition between At and Fr to be the rarest element on earth. Both the elements have very short half life period.
By: psahu63

Date of comment: Mon, Sep 6th 2010

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