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Additional
francium
English Wikipedia - The Free Encyclopedia
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Francium
Francium
is a
chemical element
with symbol
Fr
and
atomic number
87. It used to be known as
eka
-
caesium
and
actinium
K. It is the second-least
electronegative
element, behind only caesium. Francium is a highly
radioactive
metal that decays into
astatine
,
radium
, and
radon
. As an
alkali metal
, it has one
valence electron
.
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