But it was not to be. Estimates suggest that there is only about 30 g of francium in the whole of the Earth's crust. In the 1930s it was the turn of Fred Allison from the Alabama Polytechnic ...

Francium, number 87, was the last of these elements to be discovered in nature ... The element with atomic number 89, two places to the right of our 87, is actinium which had been discovered in 1899.