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- 1 dictionary result
ra⋅di⋅o⋅ac⋅tin⋅i⋅um
/
ˌreɪ
di
oʊ
ækˈtɪn
i
əm
/
Show Spelled Pronunciation
[
rey-dee-oh-ak-
tin
-ee-
uh
m
]
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radio actinium
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radio actinium
–noun
Chemistry
.
the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days.
Symbol:
RdAc, Th 227
Origin:
1905–10;
radio-
+
actinium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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[rey-dee-oh-ak-tin-ee-uh
m] 