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Lead
Lead

Protactinium
Protactinium



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Protactinium

Lead and Protactinium Periodic Table

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Periodic Table

Symbol

Pb
Pa

Group Number

143
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

74399217440133
7429905 54386242
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Space Group Name

Fm_ 3m
I4/mmm

Space Group Number

225.00139.00
11 276
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