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Define the terms (a) isotope,(b) isobar ...

Define the terms (a) isotope,(b) isobar giving one example in each case. Name the element whose isotope is used in (i) nuclear reactor,(ii) treatment of cancer.

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(i) For the definition of isotope and isobar consult section 4.12 and section 4.13
(ii) U-235 isotope is used in nuclear reactor as a fuel
(iii) Co-60 isotope is used in the treatment of cancer
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DINESH PUBLICATION-STRUCTURE OF ATOM -Short Answer Question
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