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It measures 4
In order to produce the correct sizes for the Periodic Table
and blimps
explosives
Francium Cube Element Heritage Personal Museum It measures 4Francium's atomic number is 87 and its symbol is Fr. It is extremely radioactive; its most stable isotope, francium 223, has a half life of only 22 minutes. Bulk francium has never been seen, since the extreme heat of decay resulting from its short half life would immediately vaporize any viewable quantity of the element. Named after the country it was discovered in, France. It was the last element first discovered in nature, rather than by synthesis.
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