Discovery of francium

Francium is a chemical element; it has symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223, 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.

Summary from Wikipedia (CC BY-SA 4.0) · Dates from Wikidata (CC0)

Which happened first?

• Discovery of francium happened 1 year before Discovery of neptunium
• Discovery of francium happened 1 year before Discovery of astatine
• Discovery of francium happened 2 years after Discovery of technetium
• Discovery of francium happened 2 years before Discovery of plutonium
• Discovery of francium happened 5 years before Discovery of americium

Timeline

1. Discovery of technetium1937
2. Discovery of francium (this page)1939
3. Discovery of astatine1940
4. Discovery of neptunium1940
5. Discovery of plutonium1941
6. Discovery of americium1944

Related

• Discovery of hydrogen1766
• Discovery of oxygen1774
• Discovery of PlutoFebruary 18, 1930
• Discovery of carbon1789
• Discovery of aluminium1825
• Discovery of heliumAugust 18, 1868
• Discovery of nitrogen1772
• Discovery of sulfur1777