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JEE Main202131 Aug 2021Evening ShiftChemistryd and f Block ElementsActual

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

Options

  1. A4 f 6 6 s 2
  2. B4 f 7
  3. C4 f 7 6 s 2
  4. D4 f 6

Correct answer

B. 4 f 7

Step-by-step solution

Eu Z = 63 = [ Xe ] 4 f 7 6 s 2 Eu + 2 Z = 63 = Xe 4 f 7

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