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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]
Lower ranks of coal can be less expensive, for example sub-bituminous coal can cost around US$0.038/kg carbon. [19] Graphite flakes can cost around US$0.9/kg carbon. [ 20 ] Price of synthetic industrial diamond for grinding and polishing can range from 1200 to 13 300 USD/kg, while cost per weight of large synthetic diamonds for industrial ...
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.
For starters, rice expands as you cook it, so a little goes a long way. So while a 5 lb. bag of potatoes that costs $3 might get you three side dishes, the same amount of rice will cost about $7 ...
Food prices are rising with factors like drought affecting our food supply immensely. It's not all bad news though. Conservational efforts have made one typically pricey food less expensive too!
Some brands are stepping up their efforts to make food more affordable. This week, Target announced plans to lower prices on about 5,000 items, including bread, fruit, vegetables, milk and meat.
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 abundance of the chemical elements is a measure of the occurrences of the chemical elements relative to all other elements in a given environment. Abundance is measured in one of three ways: by mass fraction (in commercial contexts often called weight fraction), by mole fraction (fraction of atoms by numerical count, or sometimes fraction of molecules in gases), or by volume fraction.