Example the following with suitable examples:
a. Ferromagnetism b. Paramagnetism
c. Ferrimagnetism d. Antiferromagnetism
e. 12 - 46 and 13 - 15 group compounds

Explanation

To explain the concepts of ferromagnetism, paramagnetism, ferrimagnetism, antiferromagnetism, and the compounds formed by groups 12-16 and 13-15 of the periodic table, we can break down the explanation into the following steps:

### Step 1: Ferromagnetism
- **Definition**: Ferromagnetism is the phenomenon where certain materials exhibit permanent magnetism even in the absence of an external magnetic field. This occurs due to the alignment of magnetic moments of the atoms in the material.
- **Examples**: Common examples of ferromagnetic substances include:
- Iron (Fe)
- Nickel (Ni)
- Cobalt (Co)
...