The Properties of the Francium Element
Symbol of Element : Fr
Atomic Number : 87
Atomic Mass: 223.0 amu
Melting Point: 27.0 °C - 300.15 °K
Boiling Point: 677.0 °C - 950.15 °K
Number of Protons/Electrons : 87
Number of Neutrons : 136
Crystal Structure: Cubic
Density @ 293 K
Color : Unknown
Definition of the Francium Element
An extremely unstable radioactive element of the alkali metals, produced artificially from actinum or thorium, having approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. It is the least electronegative of all the known elements. Francium occurs naturally to a very limited extent in uranium minerals. The Atomic Number of this element is 87 and the Element Symbol is Fr.
Origin / Meaning of the name Francium
The name originates from its country of origin, France, where the French physicist Marguerite Perey from the Curie Institute in Paris discovered it in 1939 in the alpha particle decay of actinium.
Facts about the History of the Discovery of Francium Element
Francium was discovered by Marguerite Perey of the Curie Institute in Paris in 1939.
History of the Periodic Table
Check out the brief History of the Periodic Table which details dates and the names of famous scientists and chemists who contributed to the development of the Periodic Table.
Occurrence of the Francium Element
Obtained from the decay of actinium
Naturally occurs in uranium minerals
Has the highest equivalent weight of any element
There are 33 known isotopes of francium
Abundance of Francium
% in Universe N/A
% in Sun N/A
% in Meteorites N/A
% in Earth's Crust N/A
% in Oceans N/A
% in Humans None
Uses of Francium
No known uses
