Heaviest particle is

Options

A. Meson
B. Neutron
C. Proton
D. Electron

Answer

To determine the heaviest particle among subatomic particles, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Particles**: We need to compare the masses of the following particles:
- Neutron
- Proton
- Electron
- Meson

2. **Know the Masses**:
- The mass of a neutron is approximately **1.008664 atomic mass units (u)**.
- The mass of a proton is approximately **1.007276 atomic mass units (u)**.
- The mass of an electron is approximately **0.000548 atomic mass units (u)**.
- Mesons are composite particles made of quarks and antiquarks, and their mass can vary, but they are generally heavier than electrons.

3. **Compare the Masses**:
- Neutron: 1.008664 u
- Proton: 1.007276 u
- Electron: 0.000548 u
- Mesons (typically heavier than protons and neutrons, but for this comparison, we can focus on the neutron and proton).

4. **Conclusion**:
- Among the particles listed, the neutron has the highest mass (1.008664 u), making it the heaviest particle when compared to protons and electrons.

5. **Final Answer**: The heaviest particle among the ones mentioned is the **neutron**.