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# The electronic configuration of gadolinium is

$\begin{array}{1 1}(a)\;[Xe]4f^85d^96s^2&(b)\;[Xe]4f^75d^16s^2\\(c)\;[Xe]4f^35d^56s^2&(d)\;[Xe]4f^65d^26s^2\end{array}$

The electronic configuration of gadolinium $[Xe]4f^75d^16s^2$
Note: La, Gd and Lu have a single electron in the 5d-orbitals unlike the other Lanthanoids.
edited Aug 4, 2014