Question : Which of the following is radioactive?
Option 1: Helium
Option 2: Sodium
Option 3: Thorium
Option 4: Platinum
Correct Answer: Thorium
Solution : The correct option is Thorium .
Thorium, with the chemical symbol Th and atomic number 90, is a metallic chemical element that emits relatively little radioactivity. Both French scientist Marie Curie and German chemist Gerhard Carl Schmidt independently discovered thorium's radioactivity in 1898. It is a radioactive metal that is present in nature in trace amounts.
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