free electron
Noun: * A free electron is an electron that is not bound to or orbiting a specific atom, ion, or molecule. It is not part of an atomic structure and is therefore able to move relatively freely through a material when influenced by an external force, such as an electric field.
The term is used primarily in physics and materials science to describe the charge carriers responsible for electrical conductivity in metals and other conductors. It contrasts with bound electrons, which are attached to atomic nuclei. * The high electrical conductivity of copper is due to its abundance of free electrons. * In a semiconductor, increasing the temperature can generate more free electrons. * An electric field exerts a force on a free electron, causing it to accelerate.
- "Sea of free electrons": A common conceptual model describing the structure of metallic bonding, where outer shell electrons are delocalized and move freely throughout the metal lattice.
- The metallic bond is often visualized as a lattice of positive ions immersed in a sea of free electrons.
- Conduction electron: A synonym often used interchangeably with "free electron," specifically emphasizing its role in conducting electricity.
- Delocalized electron: A broader term for an electron not associated with a single atom or covalent bond, which includes free electrons in metals.
- Charge carrier: A general term for a mobile particle carrying an electric charge (e.g., free electrons, holes, ions).
- Conduction electron
- Mobile electron
- Delocalized electron (in the context of metals)
- Bound electron
- Valence electron (when considered as part of an atom)
- Core electron
- electron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field