Estimates suggest that there is only about 30 g of francium in the whole of the ... branch in one of the three main radioactive decay series. Her analysis of the data revealed a new element ...

Perey then suggested the name Francium, after her native country, and this name was accepted. Whilst it is naturally occurring, or to be more precise, naturally formed - albeit briefly - during ...

For example, the half-life of carbon-14 is 5,730 years, but the half-life of francium-223 is just 20 minutes ... The graph shows the decay curve for a radioactive substance.