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Radium and Protactinium Periodic Table
f
Radium
Protactinium
Protactinium and Radium in Periodic Table
Summary
Periodic Table
Facts
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Periodic Table
Symbol
Ra
Pa
Group Number
2
16
3
15
Period Number
7
7
Block
s block
f block
Element Family
Alkaline Earth
Actinide
CAS Number
7440144
99+
7440133
99+
Space Group Name
Im_ 3m
I4/mmm
Space Group Number
229.00
2
139.00
11
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