Which of the following isotopes is most dangerous to human beings?

Phosphorus-32

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Strontium-90

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Caesium-137

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Iodine-131

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Solution

The correct option is B Strontium-90
Strontium-90 is a radioactive isotope of strontium produced by nuclear fission. Strontium-90 is very harmful to human beings. It get deposited in our bones and bone marrow, causing bone cancer and leukemia.
So, the correct answer is 'Strontium-90'

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