from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Two electrons functioning or regarded as functioning in concert, especially two electrons that form a covalent bond between atoms.
- noun The combination of an electron and a positron as produced by a high-energy photon.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry, physics Two
electronshaving opposite spinbut all other quantum numbersthe same; i.e two electrons in the same atomic orbitalor molecular orbital, especially such electrons that function in concert to form a covalent bond
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