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atomic number 42
atomic number 43
atomic number 44
atomic number 45
atomic number 46
atomic number 47
atomic number 48
atomic number 49
atomic number 5
atomic number 50
atomic number 51
atomic number 52
atomic number 53
atomic number 54
atomic number 55
atomic number 56
-- atomic number 57 --
atomic number 58
atomic number 59
atomic number 6
atomic number 60
atomic number 61
atomic number 62
atomic number 63
atomic number 64
atomic number 65
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atomic number 57
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Noun
1.
atomic number 57
-
a
white
soft
metallic
element
that
tarnishes
readily
;
occurs
in
rare
earth
minerals
and
is
usually
classified
as
a
rare
earth
Synonyms:
La
,
lanthanum
La
,
lanthanum
,
metal
,
metallic
element
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