Question
Give the general electronic configuration of $4f-$series elements $(OR$ lanthanoids$).$
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Answer
The general electronic configuration of 4f-series elements is, $\operatorname{Ln}[ Xe ]^{54} 4 f^{1-14} 5 d^{0-1} 6 s^2$ where $Ln$ is a lanthanoid.
Xenon has electronic configuration, $[X e]: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^{10} 4 s^2 4 p^6 4 d^{10} 5 s^2 5 p^6$
In lanthanoids, the differentiating electron enters prepenultimate shell, $4f$ m
Xenon has electronic configuration, $[X e]: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^{10} 4 s^2 4 p^6 4 d^{10} 5 s^2 5 p^6$
In lanthanoids, the differentiating electron enters prepenultimate shell, $4f$ m
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