Q. 135.0( 2 Votes )

Gadolinium belong A. [Xe] 4f75d16s2

B. [Xe] 4f65d26s2

C. [Xe] 4f86d2

D. [Xe] 4f95s1

Answer :

Here, according to Aufbau principle electron should enter 6s, 4f and then 5d,

n+l rule for

4f= 4+3 =7

5d= 5+2=7

6s= 6+0=6

Atomic number of xenon is 54, the remaining 10 electrons are distributed into 4f, 5d and 6s. Only 7 electrons go into 4f because half filled orbital leads to stability. Now, the remaining 3 electrons, two of them go into 6s and one goes into 5d.

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