Medium MCQ +4 / -1 PYQ · JEE Mains 2020

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

  1. A [Xe] 4f<sup>7</sup> 6s<sup>2</sup> and [Xe] 4f<sup>2</sup> 6s<sup>2</sup>
  2. B [Xe] 4f<sup>2</sup> and [Xe] 4f<sup>7</sup>
  3. C [Xe] 4f<sup>4</sup> and [Xe] 4f<sup>9</sup>
  4. D [Xe] 4f<sup>7</sup> and [Xe] 4f<sup>1</sup> Correct answer

Solution

Eu<sup>2+</sup> : [xe] 4f<sup>7</sup> <br><br>Ce<sup>3+</sup> : [xe] 4f<sup>1</sup>

About this question

Subject: Chemistry · Chapter: Periodic Table and Periodicity · Topic: Periodic Trends

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