electron
noun
elec·tron
i-ˈlek-ˌträn 
: an elementary particle consisting of a charge of negative electricity equal to about 1.602 × 10−19 coulomb and having a mass when at rest of about 9.109 × 10−31 kilogram or about ¹/₁₈₃₆ that of a proton
Examples of electron in a Sentence
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The simulation ends by collecting electrons that have been ejected by photons into a grid of pixels, to make an image.
—
John Peterson, Space.com, 8 July 2025
Fusion is a carbon-free process that relies on heated plasma, a gas made up of hot ions and free-moving electrons.
—Laura Schulte, jsonline.com, 2 July 2025
Compare that to, say, the electron, which weighs over half a million eV.
—ArsTechnica, 25 June 2025
Now, most of the atoms in the universe are the two simplest kinds: hydrogen, which has one proton, zero neutrons and one electron; and helium, which has two protons, two neutrons and two electrons.
—Stephen L. Levy, The Conversation, 23 June 2025
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John Peterson, Space.com, 8 July 2025
Fusion is a carbon-free process that relies on heated plasma, a gas made up of hot ions and free-moving electrons.
—Laura Schulte, jsonline.com, 2 July 2025
Compare that to, say, the electron, which weighs over half a million eV.
—ArsTechnica, 25 June 2025
Now, most of the atoms in the universe are the two simplest kinds: hydrogen, which has one proton, zero neutrons and one electron; and helium, which has two protons, two neutrons and two electrons.
—Stephen L. Levy, The Conversation, 23 June 2025
See All Example Sentences for electron
Cite this Entry
“Electron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/electron. Accessed 29 Jul. 2025.
Copy CitationKids Definition
electron
noun
elec·tron
i-ˈlek-ˌträn
: an elementary particle that has a negative charge of electricity and travels around the nucleus of an atom
Medical Definition
electron
noun
elec·tron
i-ˈlek-ˌträn
: an elementary particle consisting of a charge of negative electricity equal to about 1.602 × 10−19 coulomb and having a mass when at rest of about 9.109534 × 10−28 gram or about ¹/₁₈₃₆ that of a proton
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