From Wikipedia, the free encyclopedia
Jump to: navigation, search
Featured article Francium is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Wikipedia community. Even so, if you can update or improve it, please do so.
Main Page trophy This article appeared on Wikipedia's Main Page as Today's featured article on November 22, 2007.
Article milestones
Date Process Result
March 29, 2007 Good article nominee Listed
March 30, 2007 Peer review Reviewed
April 28, 2007 Featured article candidate Promoted
Current status: Featured article
WikiProject Elements (Rated FA-class, High-importance)
WikiProject icon This article is supported by WikiProject Elements, which gives a central approach to the chemical elements and their isotopes on Wikipedia. Please participate by editing this article, or visit the project page for more details.
Featured article FA  This article has been rated as FA-Class on the quality scale.
 High  This article has been rated as High-importance on the importance scale.
edit·history·watch·refresh Stock post message.svg To-do list for Francium:

I (Rmrfstar) believe that the information included in these books should be incorporated into this article ASAP. Unfortunately, they're not easy to find...

Electronegativity: The Pauling scale is the most commonly used system for electronegativity, and most complete electronegativity lists use it. These lists also put francium as the lowest electronegativity with 0.7. However, some of the reported values may be estimated rather than calculated. The Allen scale may be a more complete system, and it places caesium as the least electronegative element. However, it is difficult to find lists of Allen electronegativity values to confirm this. There seems to be no one source which says all of that, so for now, the Pauling value will remain, unless a better source can be found.

Version 0.5
Peer review This Natsci article has been selected for Version 0.5 and subsequent release versions of Wikipedia.


Article changed over to Wikipedia:WikiProject Elements format by User:maveric149. Elementbox converted 10:05, 15 July 2005 by Femto (previous revision was that of 15:55, 10 July 2005).

Information Sources[edit]

Some of the text in this entry was rewritten from Los Alamos National Laboratory - Francium. Additional text was taken directly from the Elements database 20001107, and Webster's Revised Unabridged Dictionary (1913). Other information was obtained from the sources listed on the main page but was reformatted and


I am no expert in this subject, but maybe we could change the phrase "making it possibly the rarest elements in the crust, along with astatine." to "making it one of the rarest elements in the crust, next to astatine." See astatine talk page for more info.

Question marks to be explained[edit]

A reminder: in the infobox, we need to explain the question marks like in "? 300 K" (it's an FA). In a few days time we can use the |melting point comment= for this. While I am here, let me note that I do not understand the lede part "and actinium K". Both the link and the "K" do not give clarification. -DePiep (talk) 12:33, 28 July 2014 (UTC)

Picture of Marguerite Perey[edit]

I went ahead and stuck a picture of Marguerite Perey in this article, but it turns out that it might not be fair use according to the wikimedia page. Suggestions? Mr.Magik-Pants (talk) 16:55, 11 March 2015 (UTC)