Francium , including Technical Data, Safety Data and its high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure,ionization energy, abundance on Earth, conductivity and thermal properties are included.

Francium is formerly known as eka-caesium and actinium K. It is the second rarest naturally occurring element, the first being Astatine. Francium has the lowest electronegativities of all known elements and it was the last element discovered in nature. Outside of the laboratory, only trace amounts of francium can be found in uranium andthorium ores. Out of all of the naturally occurring elements, francium is the most unstable. Due to its rarity and instability, commercial applications for francium do not exist.