Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202126 AugustMorning Shift
Exam
JEE Main
Year
2021
Date
26 August
Shift
Morning Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2021 · 26 August · Morning Shift · Chemistry · d and f Block Elements

The number of 4f electrons in the ground state electronic...

The number of 4f4f electrons in the ground state electronic configuration of Gd2+{Gd}^{2 +} is [Atomic number of Gd=64]Gd = 64 ]

Correct answer

7

Step-by-step solution

Electronic configuration of Gd=[Xe]4f75d16s2Gd = [ Xe ] 4{f}^{7}5{d}^{1}6{s}^{2}

Due to more stable exactly half-filled 4f74{f}^{7} shell, electron filling occur in a little higher energy 5d−5d -orbital

So configuration of Gd2+=[Xe]4f75d1{Gd}^{2 +} = [ Xe ] 4{f}^{7}5{d}^{1}

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Given below are two statements: Statement I: The number of pairs among [Ti^ 4+ , V^ 2+ ]… JEE Main 2026Given below are two statements for catalytic properties of transition metals. Statement… JEE Main 2026The correct order of first (Δ_i H_1) and second (Δ_i H_2) ionisation enthalpy values of… JEE Main 2026The correct statements among the following are. A. Basic vanadium oxide is used in the… JEE Main 2026Given below are two statements : Statement I: Presence of large number of unpaired… JEE Main 2026A paper dipped in a dil. H_2SO_4 solution of ' X ' upon treatment with SO_2 gas turns… JEE Main 2026Which of the following is NOT a physical or chemical characteristics of interstitial… JEE Main 2026Pairs of elements with the same number of electrons in their respective 4f orbital are… JEE Main 2026 Full d and f Block Elements list All JEE Main PYQs