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Question
The outer electron configuration of $Gd$ (Atomic No. $64$) is :
$4{f^3}\,5{d^5}\,6{s^2}$
$4{f^8}\,5{d^0}\,6{s^2}$
$4{f^4}\,5{d^4}\,6{s^2}$
$4{f^7}\,5{d^1}\,6{s^2}$

Solution

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