Francium
Francium is extremely rare. Because of this its chemical and physical
properties are not known. It has been studied by radiochemical
techniques, which show that its most stable state is the ion Fr+.
Francium is the least electronegative of all the known elements.
Applications
No use has been found for what little francium can be produced.
Francium in the environment
Francium occurs naturally to a very limited extent in uranium
minerals. Nevertheless it has been estimated that there might be from
340 to 550 grams of francium in the earth's crust at any one time.
Francium is the second rarest element in the crust, after astatine.
Health effects of francium
As
it is so unstable, any amount formed would decompose to other elements
so quickly that there’s no reason to study its effects on human
health.
Environmental
effects of francium
Due
to its extremely short half-life, there’s no reason for considering
the effects of francium in the environment.
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periodic elements.
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