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 ...

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 ‘francium’, with the symbol ‘Fa’, but this was quickly changed to ‘Fr’. Although peeling away two protons from actinium via alpha decay obviously results in ...

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.