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
flagAustralia
4%
0%
4%
91%
23
flagthe Philippines
0%
27%
18%
54%
11
flagthe United States
12%
15%
18%
53%
79
flagIndia
14%
17%
25%
41%
139
flagNigeria
10%
20%
30%
40%
10
flagthe United Kingdom
21%
18%
21%
39%
38
flagPoland
18%
16%
27%
36%
1233
flagGreece
38%
7%
23%
30%
13
flagthe Netherlands
14%
21%
35%
28%
14
flagPakistan
6%
13%
53%
26%
15
flagGermany
30%
20%
30%
20%
20