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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]
I'm making a fairly major edit to the history section based off a web site and paper I found. As of right now, I'm not done adding the info yet, so don't bother commenting on it *grin*. I do, however, need to find why/how alkalinium was refuted. --Cryptic C62 · Talk 02:48, 9 April 2007 (UTC) Regarding the number of isotopes.
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Research on dozens of sites to find the priciest real estate, artwork, yachts and jewels pinpoints the world’s most expensive item right now: the History Supreme Yacht, measuring 100-feet long ...
For only $2,510, or $17,636 in today’s dollars, you could have bought a Ford Mustang in 1972, a ride that would cost you at least around $30,000 at the dealership today, according to the AARP study.
Why is francium so unstable? The article doesn't explain. Google found me a Prezi presentation (), but first off that's not a reliable source for expanding the francium article, and secondly it doesn't explain why many isotopes of related elements, e.g. 238 U with 54 more neutrons than protons, are so much longer lived.
The electron of the hydrogen-like ununennium atom—oxidized so it has only one electron, Uue 118+ —is predicted to move so quickly that its mass is 1.99 times that of a non-moving electron, a consequence of relativistic effects. For comparison, the figure for hydrogen-like francium is 1.29 and the figure for hydrogen-like caesium is 1.091. [82]