How can a nucleus lose electrons (`beta`-particles) even though free electrons are not present in it?

Explanation

To understand how a nucleus can lose electrons (beta particles) even though free electrons are not present in it, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding the Composition of a Nucleus**:
- A nucleus is made up of protons and neutrons. Protons are positively charged, while neutrons have no charge.

2. **The Process of Beta Decay**:
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