Search results
Results from the WOW.Com Content Network
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]
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.
Perey named the element francium, after her home country, and it joined the other alkali metals in Group 1 of the periodic table of elements. [3] [7] Francium is the second rarest element (after astatine) — only about 550g exists in the entire Earth's crust at any given time — and it was the last element to be discovered in nature.
Any list of U.S. cities where living costs have spiked in recent years is likely to include familiar names like Boston, Miami, New York, San Francisco and Seattle. But you'll also see a rising ...
Even New York City prices seem reasonable by comparison.
If anyone finds a reference specifically discussing the issue of the electronegativity of francium, please add it!. --Itub 08:47, 12 April 2007 (UTC) Alright, quick update regarding previous concerns: There is so little reliable information about francium compounds that it doesn't make sense to make a compound section.
Cost of living per month for a family: $29,040 % more expensive than the national average: 437.8%. Total for the year for a family: $348,480.
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.