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Erbium
Erbium

Promethium
Promethium



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Erbium
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Promethium

Erbium and Promethium Periodic Table

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Periodic Table

Symbol

Group Number

Period Number

Block

Element Family

CAS Number

Space Group Name

Space Group Number

 
Er
3
6
f block
Lanthanide
7440520
P63/mmc
194.00
 
Pm
3
6
f block
Lanthanide
7440122
-
194.00