1.

In a potassium atom, electronic energy levels are in the following order                [EAMCET 1979; DPMT 1991]

A.                 \[4s>3d\]            
B.                 \[4s>4p\]
C.                 \[4s<3d\]            
D.                 \[4s<3p\]
Answer» D.                 \[4s<3p\]


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