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Erbium and Protactinium Periodic Table

Erbium
Protactinium
Protactinium and Erbium in Periodic Table


Periodic Table
Symbol
Er   
Pa   
Group Number
Not Available   
Not Available   
Period Number
6   
7   
Block
f block   
f block   
Element Family
Lanthanide   
Actinide   
CAS Number
7440520   
35
7440133   
99+
Space Group Name
P63/mmc   
I4/mmm   
Space Group Number
194.00   
5
139.00   
8
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