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  4. The electronic configuration of Pt (atomic number 78) is:

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Q. The electronic configuration of $Pt$ (atomic number 78) is:

JEE MainJEE Main 2022Structure of Atom

Solution:

${ }_{78} Pt =[ Xe ] 4 f ^{44} 5 d ^{9} 6 s ^{1}$ (Exceptional electronic configuration)