Name : Francium Symbol : Fr Atomic # : 87 Atom weight: 223 (Most stable isotope) Melting P. : 27 (Calculated value) Boiling P. : 677 (Calculated value) Oxidation : +1 Pronounced : FRAN-si-em From : Named for the nation of discovery, France Identified : Marguerite Perey in 1939 Appearance : Note : Highly unstable radioactive element [Properties] Francium is the heaviest of the alkali metals in Group 1A on the periodic chart. It is also the most scarce of these metals. In fact there is only an ounce of natural francium scattered throughout the soil and rock of the earth; so no one has bothered to come up with a way to find it, let alone refine it. All francium samples that are available for study today are manufactured artificially. There are two different approaches to producing small quantities of francium. The more direct approach is to bombard thorium with protons. The second approach is less direct, but usually more practical. Radium is the parent element in this case. Once it is subjected to heavy neutron bombardment, it is converted to a species of actinium that decays naturally and quickly to thorium. Finally, the thorium decays naturally to francium.