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Which of the following is a naturally occurring radioactive element?

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Which of the following is a naturally occurring radioactive element?

a) radon

b) plutonium

c) carbon

d) lead

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  1. c) Carbon 14 is a naturally occuring radio-active isotope of Carbon with a half-life period of 5570 years. This is used for 'Carbon dating', a method of determining age of a substance.

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