atomic number 90
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atomic number 90 Definition
(n)
a
soft
silvery
-
white
tetravalent
radioactive
metallic
element
;
isotope
232
is
used
as
a
power
source
in
nuclear
reactors
;
occurs
in
thorite
and
in
monazite
sands
atomic number 90 Synonyms
atomic number 90
Th
thorium
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