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electron Definition

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electron
noun(elec-tron)
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
electron
noun(elec-tron)
the system of electrons surrounding the nucleus of an atom
electron
noun(elec-tron)
a population of free electrons in a vacuum or in a metallic conductor
electron
noun(elec-tron)
an electron-emitting cathode and its surrounding assembly (such as electromagnets in a cathode-ray tube) for directing, controlling, and focusing a beam of electrons
electron
noun(elec-tron)
a micrograph made with an electron microscope
electron
noun(elec-tron)
an electron-optical instrument in which a beam of electrons is used to produce an enlarged image of a minute object
electron
noun(elec-tron)
a device utilizing secondary emission of electrons for amplifying a current of electrons
electron
noun, plural in form but singular in construction(elec-tron)
a branch of physics in which the principles of optics are applied to beams of electrons
electron
noun(elec-tron)
a microprobe that uses an electron beam to induce X-ray emissions in a sample
electron
noun(elec-tron)
the sequential transfer of electrons especially by cytochromes in cellular respiration from an oxidizable substrate to molecular oxygen by a series of oxidation-reduction reactions

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