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Promethium
Promethium

Polonium
Polonium



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Promethium and Polonium Periodic Table

Periodic Table

Symbol

Group Number

Period Number

Block

Element Family

CAS Number

Space Group Name

Space Group Number

 
Pm
3
6
f block
Lanthanide
7440122
-
194.00
 
Po
16
6
p block
Post-​Transition
7440086
Pm-3m
221.00