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# Periodic Table and Electron Configurations

CHEM-ICQK@P

Which of the following electron configurations belong to the Lanthanides and Actinides? ​

A

${ ns }^{1- 2 }$

B

${ ns }^{ 2 } { np }^{ 1-6 }$

C

${ ns }^{ 2 } { (n-1)d }^{ 1-10 }$

D

${ ns }^{ 2 } { (n-1)d }^{ 0 -1 }$ and ${ (n-2)f }^{1- 14 }$