First slide

Modern approach of classification of elements

Question

Which orbital is filled immediately before the 4f subshell?

Easy

A

6s
B

5p
C

5d
D

4d

Solution

$One e^{-} goes to 5 d sub-shell before the 4 f sub-shell$
$The electronic configuration of La (Z = 57) \Rightarrow [Xe]^{54} 6 s^{2} 5 d^{1} 4 f^{0}$
$Ce (Z = 58) \Rightarrow [Xe]^{54} 6 s^{2} 5 d^{1} 4 f^{1}$

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