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Protactinium
Protactinium

Polonium
Polonium



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Protactinium
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Protactinium and Polonium Periodic Table

Periodic Table

Symbol

Pa
Po

Group Number

316
0 17
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Period Number

76
2 7
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Block

f block
p block

Element Family

Actinide
Post-​Transition

CAS Number

74401337440086
7429905 54386242
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Space Group Name

I4/mmm
Pm-3m

Space Group Number

139.00221.00
11 276
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