atomic number 69
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atomic number 69 Definition
(n)
a
soft
silvery
metallic
element
of
the
rare
earth
group
;
isotope
170
emits
X
-
rays
and
is
used
in
small
portable
X
-
ray
machines
;
it
occurs
in
monazite
and
apatite
and
xenotime
atomic number 69 Synonyms
atomic number 69
thulium
Tm
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