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bluestocking
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1. protactinium
noun.
A
short-lived
radioactive
metallic
element
formed
from
uranium
and
disintegrating
into
actinium
and
then
into
lead.
Synonyms
metal
protoactinium
Pa
metallic element
atomic number 91
Antonyms
nonmetallic
Etymology
protactinium (English)
actinium (English)
-ium (English)
-um (Latin)
actin- (English)
proto- (English)
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