Polonium and Protactinium Periodic Table
Periodic Table
Symbol
Po
Pa
Group Number
16
2
Not Available
Period Number
6
7
Block
p block
f block
Element Family
Post-Transition
Actinide
CAS Number
7440086
99+
7440133
99+
Space Group Name
Pm-3m
I4/mmm
Space Group Number
221.00
3
139.00
8
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