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(a) What are radioactive isotopes ? Give...

(a) What are radioactive isotopes ? Give two examples of radioactive isotopes
(b) Give any two uses of ratioactive isotopes
(c) An element Z contains two naturally occuring isotopes `._(17)^(35) Z and ._(17)^(37)Z`. If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

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