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JEE Main201910 Jan 2019Evening ShiftChemistryStructure of AtomActual

The 71 st electron of an element X with an atomic number of 71 enters the orbital:

Options

  1. A5 d
  2. B4 f
  3. C6 p
  4. D6 s

Correct answer

A. 5 d

Step-by-step solution

  71 Lu   : Xe   4 f 14 6 s 2 5 d 1 (The last electron enters 5 d orbital)

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