For the following statement, write T for True and F for False.
J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

Explanation

To determine whether the statement "J.J. Thomson proposed that the nucleus of an atom contains only nucleons" is true or false, we can follow these steps:

### Step-by-Step Solution:

1. **Identify J.J. Thomson's Contribution**:
- J.J. Thomson is known for his discovery of the electron through experiments with cathode rays. He proposed that atoms contain tiny negatively charged particles called electrons.

2. **Understand the Concept of Nucleus**:
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