Which of the following lanthanides have no partially filled $4 f$ sub-shell but have electrons in $5 d$ sub-shell ?

C e

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L u

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P m

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N d

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Solution

The correct option is A $L u$
$L u$ has no partly filled $4 f$ sub-shell but have electrons in $5 d$ sub-shell. It's valence shell electronic configuration is $4 f^{14} 5 d^{1} 6 s^{2}$ .

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Which of the following lanthanides have no partially filled 4f sub-shell but have electrons in 5d sub-shell ?

The correct option is A LuLu has no partly filled 4f sub-shell but have electrons in 5d sub-shell. It's valence shell electronic configuration is 4f145d16s2.

Which of the following lanthanides have no partially filled $4 f$ sub-shell but have electrons in $5 d$ sub-shell ?

The correct option is A $L u$
$L u$ has no partly filled $4 f$ sub-shell but have electrons in $5 d$ sub-shell. It's valence shell electronic configuration is $4 f^{14} 5 d^{1} 6 s^{2}$ .