A) \[{{\operatorname{C}}^{14}}\]
B) \[{{\operatorname{S}}^{35}}\]
C) \[S{{r}^{90}}\]
D) \[{{\operatorname{P}}^{32}}\]
Correct Answer: C
Solution :
\[S{{r}^{90}}\] is harmfull radiological pollutant.
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