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atomic number 72
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atomic number 77
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atomic number 79
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atomic number 82
atomic number 83
atomic number 84
atomic number 85
atomic number 86
-- atomic number 87 --
atomic number 88
atomic number 89
atomic number 9
atomic number 90
atomic number 91
atomic number 92
atomic number 93
atomic number 94
atomic number 95
atomic number 96
atomic number 97
atomic number 98
atomic number 99
Atomic philosophy
atomic physics
atomic pile
atomic number 87
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Noun
1.
atomic number 87
-
a
radioactive
element
of
the
alkali-metal
group
discovered
as
a
disintegration
product
of
actinium
Synonyms:
Fr
,
francium
Fr
,
francium
,
metal
,
metallic
element
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