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In potassium atom,electronic energylevel is in the order:

$(a)\;4s > 3d\qquad(b)\;4s < 2p\qquad(c)\;4s < 3d\qquad(d)\;4s > 4p$

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$(n+l)$ for 4s=4+0=4
$(n+l)$ for 3d=3+2=5
This energy level $3d > 4s$
Hence (c) is the correct answer.
answered Jan 10, 2014 by sreemathi.v
 

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