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1. rubidium
noun.
A
soft
silvery
metallic
element
of
the
alkali
metal
group;
burns
in
air
and
reacts
violently
in
water;
occurs
in
carnallite
and
lepidolite
and
pollucite.
Synonyms
lepidolite
metal
carnallite
atomic number 37
Rb
pollucite
metallic element
Antonyms
nonmetallic
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2. rubidium-strontium dating
noun.
Geological
dating
based
on
the
proportions
of
radioactive
rubidium
into
its
decay
product
strontium;
radioactive
rubidium
has
a
half-life
of
47,000,000,000
years.
Synonyms
geological dating
dating
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