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One of the nuclides in each of the following pairs is radioactive, the other is stable. Which one is radioactive and which is stable? Explain (a) ""_(84)^(208)Po, ""_(83)^(209)Bi (b) ""_(19)^(39)K, ""_(19)^(40)K (c ) ""_(31)^(71)Ga, ""_(31)^(76)Ga |
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Answer» Solution :(a) PO has an atomic number greater than 83 and so it is radioactive. Bi-209 has 126 neutrons (a magic no), so it is expected to be stable. (b) `""_(19)^(39)K` has a magic no .of neutrons, (20), so it is expected to be stable. The isotope `""_(19)^(40)K` has an odd number of protons (19) and an odd number of neutrons (21). Since stable odd-odd nuclei are RARE, `""_(19)^(40)K` is expected to be radioactive (c ) Of the two isotopes `""_(31)^(76)Ga` LIES farther from the centre of the stability belt, so it is expected to be radioactive and `""_(31)^(71)Ga` to be stable. |
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