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25 January, 22:59

Which nuclide has a half-life that is less than one minute?

(1) cesium-137 (3) phosphorus-32

(2) francium-220 (4) strontium-90

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Answers (2)
  1. 25 January, 23:03
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    Cesium nucclide has a half life is less than one minut
  2. 25 January, 23:24
    0
    I think a good strategy for these kind of problems is to just choose the atom with the highest mass number. At any rate, the answer actually is (and I guessed it as) (2) Francium-220. It has a half life of about 30 seconds.
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