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The 71st electron of an element X

Question:

The $71^{\text {st }}$ electron of an element $X$ with an atomic number of 71 enters into the orbital :

  1. $4 \mathrm{f}$

  2. $6 p$

  3. $6 \mathrm{~s}$

  4. $5 \mathrm{~d}$


Correct Option: 1

Solution:

(1) 4f

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