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JEE Main 202131 AugustEvening Shift
Exam
JEE Main
Year
2021
Date
31 August
Shift
Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2021 · 31 August · Evening Shift · Chemistry · d and f Block Elements

The Eu ^ 2 + ion is a strong reducing agent in spite of its ground...

The Eu2+{Eu}^{2 +} ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu=63Eu = 63 ]

Options

  1. A4f66s24{f}^{6}6{s}^{2}
  2. B4f74{f}^{7}
  3. C4f76s24{f}^{7}6{s}^{2}
  4. D4f64{f}^{6}

Correct answer

B. 4f74{f}^{7}

Step-by-step solution

Eu(Z=63)=[Xe]4f76s2Eu\left(Z = 63\right) = [ Xe ] 4{f}^{7}6{s}^{2}
Eu+2(Z=63)=[Xe]4f7{Eu}^{+ 2}\left(Z = 63\right) = \left[Xe\right]4{f}^{7}
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