Use the following terms to create a concept map
atom, nucleus, protons, neutrons, electrons, isotopes, atomic number, positively charged, negatively charged, neutral, Rutherford, J.J. Thomson, Goldstein, Chadwick

Explanation

To create a concept map using the provided terms, we will follow a structured approach. Here’s a step-by-step text solution:

### Step 1: Start with the Central Concept
- **Atom**: The atom is the smallest unit of matter. It serves as the central concept of our map.

### Step 2: Identify Components of an Atom
- **Nucleus**: The atom contains a nucleus at its center.
- **Protons and Neutrons**: The nucleus is composed of protons and neutrons.
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