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Protactinium
Protactinium

Actinium
Actinium



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Protactinium
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Actinium

Protactinium and Actinium Periodic Table

Periodic Table

Symbol

Pa
Ac

Group Number

33
0 17
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Period Number

77
2 7
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Block

f block
f block

Element Family

Actinide
Actinide

CAS Number

74401337440348
7429905 54386242
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Space Group Name

I4/mmm
Fm_ 3m

Space Group Number

139.00225.00
11 276
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