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- Francium is a
radioactive chemical element which is classified among the alkaline
earth metals on the periodic table.
- It is identified with
the symbol Fr and it has an atomic number of 87.
- It is a heavy,
unstable, radioactive metal with a maximum half-life of only 22
minutes. It occurs naturally to a very limited extent in uranium
- It has a low melting
point and, if enough of it could be accumulated, it would be liquid
in a warm room.
- Francium isotopes are
obtained after thorium or uranium targets bombarding by high-energy
- Francium is the second
rarest element in the crust, after astatine.
- Franciumís isotopes,
with mass numbers ranging from 200 to 232, most commonly undergo
alpha- or beta-decay and the Francium-223 is the elementís longest
- It can emit an
alpha-particle to form astatine-219 or a beta-particle to form
- Francium is produced
by Uranium and thorium minerals and is in vanishingly small
quantities via their natural radioisotope decay chains.
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