What does electron mean?
An electron is a fundamental subatomic particle carrying a negative electric charge. It is one of the basic building blocks of all matter: electrons surround the nucleus of every atom, and their arrangement determines how atoms bond and react chemically. Because electrons can move relatively freely through certain materials, their flow constitutes electric current, making them central to virtually all modern technology — from household wiring to semiconductors, computers, and medical imaging devices such as the electron microscope. The term derives from the Greek 'elektron', meaning amber, a substance whose static properties were known to the ancients and which gave rise to the broader vocabulary of electricity. First identified as a distinct particle in the late nineteenth century, the electron remains the lightest known charged particle and a cornerstone of physics, chemistry, and electronics. Its study underpins our understanding of everything from lightning to the inner workings of a smartphone.
nounA stable subatomic particle with a negative electric charge, found in all atoms and moving around the nucleus. Electrons are the primary carriers of electricity in solids and are responsible for chemical bonding.
- The stable elementary particle carrying a unit negative charge, orbiting an atom's nucleus or moving freely through matter; the carrier of electrical current.
"When a voltage is applied across the wire, electrons flow toward the positive terminal."
"Chemists describe bonding in terms of shared pairs of electrons between atoms."
"The scanning electron microscope revealed details invisible to ordinary optical instruments."
Standard regular plural. Used both for multiple particles within an atom and for free-moving carriers in a conductor.
"Metals conduct electricity well because their outer electrons are loosely bound and free to move."
The word 'electron' comes from the ancient Greek for amber — because rubbing amber was how humans first discovered static electricity over 2,000 years ago.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of electron
The word 'electron' was coined in 1891 by the Irish physicist George Johnstone Stoney, who had earlier calculated the fundamental unit of electric charge and named it after the Greek 'elektron', meaning amber — the material in which static electricity was first observed in antiquity. The term was adopted when J.J. Thomson demonstrated the existence of the particle itself in 1897. It shares its Greek root with the wider family of electrical terms, including 'electric', 'electricity', and 'electronic'.
Related word forms
How electron is actually used
Strictly scientific register, but widely understood by general readers. In physics, 'electron' refers to the elementary particle specifically, distinguishing it from heavier charged particles such as protons (positive) and neutrons (uncharged). The plural 'electrons' is standard in both British and American English.
Easily confused with electron
'Electric' is an adjective relating to electricity, whereas 'electron' is the noun naming the negatively charged subatomic particle itself.
'Electronic' describes devices that operate using controlled electron flow (such as circuits and computers), while 'electron' is the particle responsible for that flow.