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Polonium
Polonium

Protactinium
Protactinium



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Protactinium

Polonium and Protactinium Periodic Table

Periodic Table

Symbol

Po
Pa

Group Number

163
0 17
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Period Number

67
2 7
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Block

p block
f block

Element Family

Post-​Transition
Actinide

CAS Number

74400867440133
7429905 54386242
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Space Group Name

Pm-3m
I4/mmm

Space Group Number

221.00139.00
11 276
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