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actinium

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Actinium

radium $\longleftarrow$ 89 $\longrightarrow$ thorium

Pronunciation

enPR: ăktĭn'ēəm, IPA ^(key): /ækˈtɪniəm/
Audio (UK) (file)

Noun

Singular
actinium

Plural
none

(uncountable) Actinium is a radioactive element with an atomic number of 89 and symbol Ac.

The Periodic Table

H

B

C

N

O

F

P

S

K

V

Y

I

W

U

Alkaline earth metals

Transition elements

Other metals

Other nonmetals

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