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30-12-2015
Chemistry

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Which nuclide has a half-life that is less than one minute?
(1) cesium-137 (3) phosphorus-32
(2) francium-220 (4) strontium-90

Respuesta :

30-12-2015

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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