Francium was discovered by Marguerite Perey in France (from which the element takes its name) in 1939. It was the last element discovered in nature, rather than synthesized. Trace amounts found can be found in uranium and thorium ores, where the isotope francium-223 continually forms and decays, the other isotopes are entirely synthetic. The largest amount ever collected of any isotope was a cluster of about 10,000 atoms (of francium-210) created as an ultracold gas at Stony Brook in 1997.
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| - Francium was discovered by Marguerite Perey in France (from which the element takes its name) in 1939. It was the last element discovered in nature, rather than synthesized. Trace amounts found can be found in uranium and thorium ores, where the isotope francium-223 continually forms and decays, the other isotopes are entirely synthetic. The largest amount ever collected of any isotope was a cluster of about 10,000 atoms (of francium-210) created as an ultracold gas at Stony Brook in 1997.
- Francium is element 87 on the periodic table. It is radioactive and has a half-life of only 22 minutes, which gives it no practical application. However, it reacts with water violently, causing a huge explosion when reacting.
- Francium (symbol Fr) is a chemical element, atomic number 87 on the periodic table.
- A fast, addictive denpa song with meaningless lyrics. It is included on the compilation album VocaloVanguard fast.
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| - Marguerite Perey
- francium
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| - 87(xsd:integer)
- Named after the country of France, where it was discovered.
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- sm15573720
- sm15757476
- sm6460566
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| - VOCALOID cover
- UTAU cover
- Arrangement
- Arrangement; Instrumental
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| - History
- General Properties
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- Bucchigiri-P
- Kitkat , 総会計のん , UtauReni
- Lenkyunirero-P , UtauReni
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| - Len's Cover
- Famicom Arrangement
- Ringtone Arrangement
- Tei and Teiru's Cover
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