Q. 54.0( 5 Votes )

The electronic co A. [Xe] 4f3 5d5 6s2

B. [Xe] 4f7 5d2 6s1

C. [Xe] 4f7 5d1 6s2

D. [Xe] 4f8 5d6 6s2

Answer :

As z= 64 so the nearest noble gases would be xenon. After that 10 electrons would be left so the configuration is given by this option. filling of s orbitals of nth shell takes before the filling of d orbitals of (n-1)th shell. Therefore, option ii) is incorrect. Options i) and iv) are incorrect as in the third option f orbital has half filled stability which results in the stability of the whole atom.

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