Which of the following is a charge less particle?
Neutron
Identifying Chargeless Particles in Physics
Understanding the properties of subatomic particles and radioactive decay products is fundamental in physics and chemistry. The question asks to identify which of the given options is a chargeless particle.
Analyzing the Options
Let's examine the charge associated with each option:
- Alpha particle: An alpha particle consists of two protons and two neutrons bound together, identical to a helium nucleus (\(^{4}_{2}\text{He}\)). Since it contains two protons, each with a charge of \(+1e\), and neutrons have no charge, an alpha particle has a total charge of \(+2e\). Alpha particles are positively charged.
- Proton: A proton is a stable subatomic particle with a positive elementary charge. It is found in the nucleus of an atom. The charge of a proton is \(+1e\). Protons are positively charged.
- Electron: An electron is a stable subatomic particle with a negative elementary charge. Electrons orbit the nucleus of an atom. The charge of an electron is \(-1e\). Electrons are negatively charged.
- Neutron: A neutron is a subatomic particle with no net electric charge. Neutrons are found in the nucleus of an atom, along with protons. The charge of a neutron is \(0\). Neutrons are chargeless.
Comparing Particle Charges
We can summarize the charges of these particles in a table:
| Particle | Composition | Charge |
|---|---|---|
| Alpha particle | 2 Protons, 2 Neutrons (Helium nucleus) | \(+2e\) (Positive) |
| Proton | Fundamental particle | \(+1e\) (Positive) |
| Electron | Fundamental particle | \(-1e\) (Negative) |
| Neutron | Fundamental particle | \(0\) (Chargeless/Neutral) |
Conclusion: Identifying the Chargeless Particle
Based on the analysis of the charges of each particle, the neutron is the only one among the given options that has no net electric charge. It is a chargeless particle.
Revision Table: Understanding Particle Charges
| Particle | Charge | Location |
|---|---|---|
| Proton | \(+1e\) | Nucleus |
| Neutron | \(0\) | Nucleus |
| Electron | \(-1e\) | Orbiting the nucleus |
| Alpha particle | \(+2e\) | Emitted during radioactive decay (is a nucleus itself) |
Additional Information on Subatomic Particles
Subatomic particles are the particles that are smaller than an atom. The main subatomic particles that make up an atom are protons, neutrons, and electrons. These particles have different properties, including mass and charge, which determine the behavior of atoms and matter.
- Protons and neutrons are found in the dense central part of the atom called the nucleus. They are collectively known as nucleons.
- Electrons are much lighter than protons and neutrons and orbit the nucleus in specific energy levels or shells.
- The charges of a proton and an electron are equal in magnitude but opposite in sign. The charge of a neutron is zero.
- Alpha particles are a type of ionizing radiation released during alpha decay, a form of radioactive decay. They are composite particles.
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