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[I just had the misfortune of having to write an essay on Francium, for my GCSEs, so i decided to give some information on it to other people who need it for these kinds of circumstances.]
There is no more than one ounce of Francium in the Earths crust at any one time. In fact, unlike other alkali metals, it was not 'stumbled upon'. It took many years and a lot of studying to work out that there must be another group one element with a higher reactivity than Caesium. It is not possible to do any tests on Francium as it has a half life of 22 minutes but we can work out most things about it by looking at the other Group 1 metals....x...Prisca Zia...x...

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16y ago
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14y ago

Probably approx. 30 grams.

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9y ago

most reactive of all elements

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Q: What is the abundance of fluorine in the earth's crust?
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