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Fr
Francium
Atomic no.:
87
Atom. weight: 223.0197
Density: 2.5
Class:
alkali metal
Melting point: 27°C
Boiling point: 677°C
Colour: silvery shiny
   
Discoverer: Marguerite Perey
Place: Paris
Year: 1939

Francium formerly known as eka-caesium and actinium K, is a chemical element that has the symbol Fr and atomic number 87. It has the lowest known electronegativity of all known elements, and is the second rarest naturally occurring element (after astatine). Francium is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron. 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. Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium-223 continually forms and decays. As little as 30 g (one ounce) exists at any given time throughout the Earth's crust; the other isotopes are entirely synthetic. The largest amount ever collected of any isotope was a cluster of 10,000 atoms (of francium-210) created as an ultracold gas at Stony Brook in 1997.

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 Acrylic Element cube - Francium - 50mm  Art. Nr. 003025  
Acrylic Element cube - Francium - 50mm
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The Sensation! Acrylic Element-blocks NEW!

Francium - placeholder - Radioactive symbol ONLY - Does not contain any Francium!!

The innovation! Selected element samples in amply amount embedded in 50x50x50mm first-class crystal clear acrylic (not cheap resin!) . Totally lightfast, high gloss polish. The text is embedded inside! Hand crafted! Made in the European Union! Each acrylic block is a unique and individual piece! EXTREMELY eye-catching!

These original acrylic cubes are used in many important and famous periodic table collections allover the world!

100% Handmade in the European Union!

 

Each cube comes in its separate original box!
     

Complete illuminated displays with our cubes are available on request

Amount: 1 St.
Purity : -------
Packing: PE bag
35.00
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