The energies of the 4s, 4p, and 4d levels of potassium are −4.339eV, −2.73eV and −0.94eV correspondingly. a)Calculate Zeff for 4s state. Express your answer using three significant figures. b)Calculate Zeff for 4p state. c)Calculate Zeff for 4d state. d)What trend do your results show? How can you explain this trend?