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Polonium
Polonium

Neptunium
Neptunium



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Polonium and Neptunium Periodic Table

Periodic Table

Symbol

Po
Np

Group Number

163
0 17
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Period Number

67
2 7
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Block

p block
f block

Element Family

Post-​Transition
Actinide

CAS Number

74400867439998
7429905 54386242
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Space Group Name

Pm-3m
Pnma

Space Group Number

221.0062.00
11 276
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