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Solution


Q.

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium          [2015, 1997]
 
1 [Xe] 4f95s1  
2 [Xe] 4f75d16s2  
3 [Xe] 4f65d26s2  
4 [Xe] 4f86d2  

Ans.

(2)