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Which is the rarest naturally occurring element of earth? |
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(a) |
Gold |
(b) |
Antimony |
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(c) |
Germanium |
(d) |
Astatine |
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Which is the rarest naturally occurring element of earth? |
|
|||
|
(a) |
Gold |
(b) |
Antimony |
|
|
(c) |
Germanium |
(d) |
Astatine |
|