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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

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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2 votes
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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User Eric Auld
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1 Answer

5 votes
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.
answered
User Starson Hochschild
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