Which of the following statements correctly describes the value of the effective nuclear charge, Z*, felt by

(a) The 2s electron at a large distance from a Li atom?
(i) Z* equals 1.
(ii) Z* is between 1 and 3.
(iii) Z* equals 3.
(b) The 2s electron at its most probable distance from the nucleus of a Li atom?
(i) Z* equals 1.
(ii) Z* is between 1 and 3.
(iii) Z* equals 3.