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Biology, 19.12.2019 15:31 baegel

Francium has 36 isotopes, but only francium-223 occurs in nature. francium-223 spontaneously emits particles and energy, so francium-223 is a (an) of francium.

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Francium has 36 isotopes, but only francium-223 occurs in nature. francium-223 spontaneously emits p...
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