Which of the following sets of elements does | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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

Vedclass · Accepted Answer

$La$,$Ac$,$Th$

Vedclass · Answer

(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?

Similar Questions

The correct option with the order of melting points of the pairs $(Mn, Fe)$, $(Tc, Ru)$ and $(Re, Os)$ is $:$

Write a brief note on the electronic configurations of the transition elements.

Based on the given outer electronic configurations,which element will exhibit the highest oxidation state?

The set of elements which obey the general electronic configuration $(n-1)d^{1-10}ns^2$ is

Which of the following pairs has approximately the same ionic size?

Vedclass Test Series

Exam Paper Generator

Online Exam Module