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Q. 8.     Explain with examples  

   (iv)     Isobars.

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Isobars are the atoms of different elements having the same mass number but different atomic numbers.

Example: ^{40}Ca_{20} and ^{40}Ar_{18}  . Mass numbers of calcium and argon atoms have different atomic numbers (20 and 18 ) but the same mass number 40.

Two uses of isotopes are:

(i) An isotope of uranium is used as a fuel in nuclear reactors.

(ii) An isotope of cobalt is used in the treatment of cancer.

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Pankaj Sanodiya

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