Question

which is rarest metal in earth ​

Answer 1

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Francium

It is the rarest metal on earth. It is a chemical element with the symbol Fr and atomic number 87. 

Answer 2

Answer:

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The rarest stable metal is tantalum. The rarest metal on earth is actually francium, but because this unstable element has a half life of a mere 22 minutes, it has no practical use

Explanation:

purest form of the following is above