(a) The energy of the 28 state of lithium is -5.391eV. Calculate the value of Zeff for this state.
(b) The energy of the 4s state of potassium is -4.339eV. Calculate the value of Zeff for this state.
(c) Compare Zeff for the Zs state of lithium, the 38 state of sodium (see Example 41.7), and the 4s state of potassium. What trend do you see? How can you explain this trend?