The particles present in the nucleus of an atom are-

Options

A. the proton and the electron
B. the electron and the neutron
C. the proton and the neutron
D. none of these

Answer

To determine the particles present in the nucleus of an atom, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Nucleus**: The nucleus is the central part of an atom, which contains most of its mass and is positively charged.

2. **Identifying the Particles**: The primary particles found in the nucleus are:
- **Protons**: These are positively charged particles. Each proton has a mass of approximately 1 atomic mass unit (amu).
- **Neutrons**: These are neutral particles (no charge) that also have a mass of approximately 1 amu.

3. **Conclusion**: Based on the information, we can conclude that the nucleus of an atom contains:
- Protons
- Neutrons

4. **Atomic Mass Calculation**: The atomic mass of an atom is determined by the sum of the number of protons and neutrons present in the nucleus.

5. **Final Answer**: Therefore, the particles present in the nucleus of an atom are **protons and neutrons**.