Solveeit Logo
Login

Question

Chemistry Question on Some Applications of d- and f-Block Elements

The electronic configurations of bivalent europium and trivalent cerium are : (atomic number: Xe=54,Ce=58,Eu??63Xe = 54, Ce =58, Eu ??63)

A

[Xe]4f7[Xe] 4f^7 and [Xe]4f1[Xe] 4f^1

B

[Xe]4f7 6s2[Xe] 4f^7 \,6s^2 and [Xe]4f2 6s2[Xe] 4f^2\,6s^2

C

[Xe]4f2[Xe] 4f^2 and [Xe]4f7[Xe] 4f^7

D

[Xe]4f4[Xe] 4f^4 and [Xe]4f9[Xe] 4f^9

Answer

[Xe]4f7[Xe] 4f^7 and [Xe]4f1[Xe] 4f^1

Explanation

Solution

Eu63⇒ [Xe]4f75d∘6s2Eu_{63} \Rightarrow\, \left[Xe\right] 4 f^{7} 5 d^{\circ} 6s^{2} Eu2⊕⇒[Xe]4f7Eu^{2\oplus} \Rightarrow \left[Xe\right]4f^{7} Ce58⇒[Xe]4f15d16s2Ce_{58} \Rightarrow\left[Xe\right]4 f^{1} 5d^{1} 6s^{2} Ce3⊕⇒ [Xe]4f1Ce^{3\oplus} \Rightarrow\, \left[Xe\right]4f^{1}