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As of 2020, the most expensive non-synthetic element by both mass and volume is rhodium. It is followed by caesium, iridium and palladium by mass and iridium, gold and platinum by volume. Carbon in the form of diamond can be more expensive than rhodium. Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars.
Francium-223 is the most stable isotope, with a half-life of 21.8 minutes, [8] and it is highly unlikely that an isotope of francium with a longer half-life will ever be discovered or synthesized. [22] Francium-223 is a fifth product of the uranium-235 decay series as a daughter isotope of actinium-227; thorium-227 is the more common daughter. [23]
Francium 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 is continually formed and continually decays.
It’s not surprising to find a few cars on this list of the world’s most expensive things. In 2018, a 1962 red Ferrari GTO sold to an anonymous buyer at Sotheby’s auction in Monterey for $48. ...
18. Platinum. Cost: $33.02 per gram Platinum is a beautiful precious metal that is in a similar category as gold and silver. All three of these metals are frequently traded in the global markets ...
Guinness World Records lists Leonardo da Vinci's Mona Lisa as having the highest insurance value for a painting. On permanent display at the Louvre in Paris, the Mona Lisa was assessed at US$100 million on 14 December 1962. [3] Taking inflation into account, the 1962 value would be around US$1010 million in 2023. [4]
The booming U.S. stock market will help keep the dollar expensive as global investors pour money into America, a foreign exchange strategist said. But the politics of any trade deals that the ...
The claim that francium has a lower electronegativity than caesium is widely, though not universally, repeated: this would be expected on the basis of periodicity, but measurements show that the ionization energy of francium is higher (4.0712 eV; Andreev, S.V.; Letokhov, V.S.; Mishin, V.I., Laser resonance photoionization spectroscopy of ...