Niobium and Protactinium Periodic Table
Periodic Table
Symbol
Nb
Pa
Group Number
5
13
Not Available
Period Number
5
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7440031
99+
7440133
99+
Space Group Name
Im_ 3m
I4/mmm
Space Group Number
229.00
1
139.00
8
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