Q.

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

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a

Phosphorus -32

b

Strontium - 90

c

Cesium - 137

d

Iodine - 131

answer is B.

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Detailed Solution

Strontium-90 is a radioactive isotope of strontium produced by nuclear fission. Strontium-90 is very harmful to humans, by getting a deposit in our bones and bone marrow, causing bone cancer.
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