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(a) Write two differences between isobars and isotopes. 

(b) Write uses of Co-60 and U-235. 


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(a) Difference between isobars and isotopes are as following: 

(b) (i) Isotope of cobalt (Co-60) is used in the treatment of cancer. It is used in cancer therapy and as a radioactive tracer in biology. 

(ii) Isotope of uranium (U-235) is used as a fuel in nuclear reactor.

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