Which is the most rarerest elemental metal on earth?
Answer:
Astatine (At) is much rarer than uranium (U). Astatine is radioactive and essentially unavailable in nature. The longest-lived isotope, 210At, has a half-life of only 8.3 hours. It forms when bismuth (Bi) isotope 209Bi is bombarded with α-particles.
astatine does not occur naturally in any appreciable amount, (it is a short lived decay product of thorium and uranium) so it would be more rare. I believe that there is never more than about 100 milligrams in existence at any one time on earth.
Uranium is much more prevalant
astatine (85) is the answer
Two rarest elements are astatine (85)
and francium (87)...
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