- Francium is a chemical element; it has symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223 (originally called actinium K after the natural decay chain in which it appears), has a half-life of only 22 minutes. It is the second-most electropositive element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Francium’s isotopes decay quickly into astatine, radium, and radon. The electronic structure of a francium atom is [Rn] 7s1; thus, the element is classed as an alkali metal.
- Seattle Neighborhoods: Belltown-Denny Regrade — Thumbnail History (historylink.org)
The area of Seattle stretching north of the central business district from Stewart Street to Mercer Street is usually dubbed the Denny Regrade, acknowledging the area’s forcible flattening by city engineers early in the twentieth century. It incorporates the older Belltown district, originally west of 2nd Avenue but today more broadly defined by its various denizens. The area today combines artist lofts and hangouts with new highrises where condos and apartments are providing close-in housing. Following the new, mostly affluent residents, a number of upscale restaurants and clubs have established a brisk trade in the area. The result, at least for the time being, is a yeasty combination of the bohemian and the trendy, with a significant nightlife.