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  4. The lanthanide element that has the electronic configuration, [Xe]4f75d16s2 is

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Q. The lanthanide element that has the electronic configuration, $ [Xe]4f^{7}5d^{1}6s^{2} $ is

J & K CETJ & K CET 2011The d-and f-Block Elements

Solution:

The atomic number of gadolinium ($Gd$) is $64$ and its electronic configuration is as
$ Gd(64):[Xe]4f^{7}\,5d^{1}6s^{2} $