Which of the following sets of elements does | vedclass

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(C) The electronic configurations are as follows:$(I)$ Lanthanum ($La$,$Z=57$): $[Xe]_{54} \cdot 5d^1 \cdot 6s^2$ (No $f$-electrons)$(II)$ Uranium ($U

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$La$,$Ac$,$Th$

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(C) The electronic configurations are as follows:$(I)$ Lanthanum ($La$,$Z=57$): $[Xe]_{54} \cdot 5d^1 \cdot 6s^2$ (No $f$-electrons)$(II)$ Uranium ($U$,$Z=92$): $[Rn]_{86} \cdot 5f^3 \cdot 6d^1 \cdot 7s^2$ (Has $f$-electrons)$(III)$ Lawrencium ($Lr$,$Z=103$): $[Rn]_{86} \cdot 5f^{14} \cdot 6d^1 \cdot 7s^2$ (Has $f$-electrons)$(IV)$ Thorium ($Th$,$Z=90$): $[Rn]_{86} \cdot 6d^2 \cdot 7s^2$ (No $f$-electrons)$(V)$ Actinium ($Ac$,$Z=89$): $[Rn]_{86} \cdot 6d^1 \cdot 7s^2$ (No $f$-electrons)$(VI)$ Cerium ($Ce$,$Z=58$): $[Xe]_{54} \cdot 4f^1 \cdot 5d^1 \cdot 6s^2$ (Has $f$-electrons)Based on the electronic configurations,the elements $La$,$Ac$,and $Th$ do not possess $f$-electrons.Therefore,option $(c)$ is the correct answer.

Which of the following sets of elements does not possess $f$-electrons?

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