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Protactinium
Protactinium

Americium
Americium



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Protactinium
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Americium

Protactinium and Americium Periodic Table

Periodic Table

Symbol

Pa
Am

Group Number

310
0 17
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Period Number

77
2 7
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Block

f block
f block

Element Family

Actinide
Actinide

CAS Number

74401337440359
7429905 54386242
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Space Group Name

I4/mmm
P63/mmc

Space Group Number

139.00194.00
11 276
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