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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]
The lowest average price per gallon under Biden so far was in January at $2.957, still higher than the highest average price under Trump — $2.208 in May 2018.
Prior incorrect data: Why is the 1995 estimate of Francium in the article, if the number is wrong? Seems kinda trivial to report that. Why not just give the current, better, estimate and be done at that. But this article is really improving!--Jayron32|talk|contribs 02:00, 5 April 2007 (UTC) Fixed both of those. I'm feeling a bit dumb right now.
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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 average price for a dozen large eggs in California hovered around $6.72 as of this week, according to data from the U.S. Department of Agriculture. The cause?