What are important features of J.J. Thomson's atom model ? Why was it discarded ?

Explanation

### Step-by-Step Text Solution:

**1. Introduction to J.J. Thomson's Atomic Model:**
- J.J. Thomson proposed his atomic model in 1897 after the discovery of the electron. His model is often referred to as the "plum pudding model."

**2. Important Features of J.J. Thomson's Atom Model:**
- **Presence of Electrons:** Thomson's model states that every atom contains electrons. This was a groundbreaking idea as it introduced the concept of subatomic particles.
- **Electrically Neutral Atoms:** According to Thomson, atoms are electrically neutral. This means that the number of negatively charged electrons is equal to the number of positively charged particles (which he referred to as "corpuscles") in the atom.
...