1.

The 71st electron of an element X with an atomic number of 71 enters into the orbital (1) 6s (2) 6p (3) 5d (4) 4f

Answer»

The correct option is (3) 5d.

Explanation:

71Lu --> [Xe] 4f14 5d1 6s2 

71th electron enters into 5d orbital 

so 5d is the orbital.



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