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Terbium
Terbium
is a
chemical element
with symbol
Tb
and
atomic number
65. It is a silvery-white
rare earth
metal
that is
malleable
,
ductile
and soft enough to be cut with a knife. Terbium is never found in nature as a free element, but it is contained in many
minerals
, including
cerite
,
gadolinite
,
monazite
,
xenotime
and
euxenite
.
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