Maximum oxidation state is shown by:
1.  La
2.  Gd
3.  Eu
4.  Am

An incorrect statement among the following is :

The general electronic configuration of lanthanoids is:

1. (n – 2) f ^1–14 (n – 1) s² p⁶ d^0–1 ns²

2. (n – 2) f ^10–14 (n – 1) d^0–1 ns²

3. (n – 2) f ^0–14 (n – 1) d¹⁰ ns²

4. (n – 2) d^0–1 (n – 1) f ^1–14 ns²

The correct order of ionic radii of Y³⁺, La³⁺, Eu³⁺, and Lu³⁺ is:

(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

1. Y³⁺ < La³⁺ < Eu³⁺ < Lu³⁺

2. Y³⁺ < Lu³⁺ < Eu³⁺ < La³⁺

3. Lu³⁺ < Eu³⁺ < La³⁺ < Y³⁺

4. La³⁺ < Eu³⁺ < Lu³⁺ < Y³⁺

The main reason for a larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is: