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Radium and Actinium Periodic Table
f
Radium
Actinium
Actinium and Radium in Periodic Table
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Periodic Table
Symbol
Ra
Ac
Group Number
2
16
Not Available
Period Number
7
7
Block
s block
f block
Element Family
Alkaline Earth
Actinide
CAS Number
7440144
99+
7440348
99+
Space Group Name
Im_ 3m
Fm_ 3m
Space Group Number
229.00
1
225.00
2
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