There is about an ounce of francium in the Earth’s crust. It’s the most unstable of the first 101 elements. It lasts only 45 seconds longer than an ...

Mlle. Marguerite Perey of the Curie Institute, Paris, discovered francium in 1939. It is the heaviest known member of the alkali metal series and occurs as a result of an alpha disintegration of ...

"Take francium-211, for example: its nuclear magnetic moment was previously determined to be in the range 3.92 to 4.08 ... The researchers found that depending on the strength of the ...