The electronic configurations of bivalent europium and trivalent cerium are: (atomic number: Xe = 54 , Ce = 58 , Eu = 63) (1) [Xe]4f2 and [Xe]4f7 (2) [Xe]4f7 and [Xe]4f1 (3) [Xe]4f76s2 and [Xe]4f26s2 (4) [Xe]4f4 and [Xe]4f9

JEE Main · 2020 · Shift-ImediumDNF-255

The electronic configurations of bivalent europium and trivalent cerium are: (atomic number: Xe = 54 , Ce = 58 , Eu =…

d & f-Block Elements · Class 12 · JEE Main Previous Year Question

Question

The electronic configurations of bivalent europium and trivalent cerium are: (atomic number: $\ce{Xe = 54 , Ce = 58 , Eu = 63}$ ) (1) $\ce{[Xe]4f^2}$ and $\ce{[Xe]4f^7}$ (2) $\ce{[Xe]4f^7}$ and $\ce{[Xe]4f^1}$ (3) $\ce{[Xe]4f^76s^2}$ and $\ce{[Xe]4f^26s^2}$ (4) $\ce{[Xe]4f^4}$ and $\ce{[Xe]4f^9}$

Options

a
$\ce{[Xe]4f^2}$ and $\ce{[Xe]4f^7}$
b
$\ce{[Xe]4f^7}$ and $\ce{[Xe]4f^1}$
✓
c
$\ce{[Xe]4f^76s^2}$ and $\ce{[Xe]4f^26s^2}$
d
$\ce{[Xe]4f^4}$ and $\ce{[Xe]4f^9}$

Correct Answerb

$\ce{[Xe]4f^7}$ and $\ce{[Xe]4f^1}$

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