The rarest chemical element naturally ocurring in the Earth's crust is...

rhenium
iridium
osmium
astatine
Astatine is a radioactive chemical element with symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. The total amount of astatine in the Earth's crust is estimated to be less than one gram at any given time.
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Answers by country

rhenium
iridium
osmium
astatine
answers
flagthe United Kingdom
18%
0%
0%
81%
11
flagAustralia
10%
0%
10%
80%
10
flagthe United States
17%
8%
18%
55%
58
flagIndia
11%
14%
26%
46%
67
flagPoland
18%
15%
27%
37%
682
flagthe Netherlands
15%
23%
30%
30%
13
flagGermany
20%
20%
50%
10%
10