Name the member of the lanthanoids series which exhibit+4 oxidation states and those which exhibit+2 oxidation state. Try to correlate this types of behavior with the electronic configuration of these elements.

Explanation

To answer the question regarding the lanthanoids series and their oxidation states, we will follow these steps:

### Step 1: Identify the Lanthanoids
The lanthanoid series consists of 15 elements from lanthanum (La, atomic number 57) to lutetium (Lu, atomic number 71). The elements are:
- Lanthanum (La, 57)
- Cerium (Ce, 58)
- Praseodymium (Pr, 59)
- Neodymium (Nd, 60)
...