electrum

electrum
Electron E*lec"tron, n. [NL., fr. Gr. 'h`lektron. See {Electric}.] 1. Amber; also, the alloy of gold and silver, called {electrum}. [archaic] [1913 Webster]

2. (Physics & Chem.) one of the fundamental subatomic particles, having a negative charge and about one thousandth the mass of a hydrogen atom. The electron carries (or is) a natural unit of negative electricity, equal to 3.4 x 10^{-10} electrostatic units, and is classed by physicists as a {lepton}. Its mass is practically constant at the lesser speeds, but increases due to relativistic effects as the velocity approaches that of light. Electrons are all of one kind, so far as is known. Thus far, no structure has been detected within an electron, and it is probably one of the ultimate composite constituents of all matter. An atom or group of atoms from which an electron has been detached has a positive charge and is called a {cation}. Electrons are projected from the cathode of vacuum tubes (including television picture tubes) as {cathode rays} and from radioactive substances as the {beta rays}. Previously also referred to as {corpuscle}, an obsolete term. The motion of electrons through metallic conductors is observed as an electric current. A particle identical to the electron in mass and most other respects, but having a positive instead of a negative charge, is called a {positron}, or {antielectron} [Webster 1913 Suppl. +PJC]


The Collaborative International Dictionary of English. 2000.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • électrum — [ elɛktrɔm ] n. m. • 1549; électron av. 1530; lat. electrum, gr. êlektron, par anal. de couleur avec l ambre ♦ Archéol. Alliage naturel d or et d argent estimé dans l Antiquité. ● électrum nom masculin (bas latin electrum, du grec êlektron, ambre …   Encyclopédie Universelle

  • Electrum — Électrum Pièce lydienne en électrum (avant le VIe siècle av. J. C.). L’électrum[1] est un alliage compos …   Wikipédia en Français

  • ELECTRUM — Graecis Ἤλεκτρον, vox est ἐκ τῶ πολλὰ σημαινουσῶν. Apud Aristophan. enim Equit. Ἐκπιπτουσῶν τῶ ἠλεκτρων, καὶ τȏυ τόνου οὐκέτ᾿ ενόντος, Ἤλεκτραclavi sunt ex electro, quibus muniebantur pedes lectorum. Electrum enim spuma auri seu purgamentum… …   Hofmann J. Lexicon universale

  • electrum — ELÉCTRUM s.n. Aur nativ care conţine o mare cantitate de argint, de culoare galben deschis până la albă argintie, maleabil şi ductil. – Din fr. électrum. Trimis de LauraGellner, 12.06.2004. Sursa: DEX 98  eléctrum s. n. Trimis de siveco,… …   Dicționar Român

  • Electrum — Saltar a navegación, búsqueda La palabra Electrum tuvo dos significados en la antigüedad: Una aleación de oro y plata, en proporción aproximada de 4:1, similar al actual oro blanco. El ámbar, conocido por los griegos desde la época homérica.… …   Wikipedia Español

  • electrum — alloy of gold and up to 40% silver, late 14c. (in O.E. elehtre), from L. electrum alloy of gold and silver, also amber (see ELECTRIC (Cf. electric)). So called probably for its pale yellow color …   Etymology dictionary

  • Electrum — E*lec trum, n. [L., fr. Gr. ?. See {Electric}, and cf. {Electre}, {Electron}.] 1. Amber. [1913 Webster] 2. An alloy of gold and silver, of an amber color, used by the ancients. [1913 Webster] 3. German silver plate. See {German silver}, under… …   The Collaborative International Dictionary of English

  • Electrum — (lat.), 1) Bernstein; 2) Metall, aus 4/5 Gold u. 1/5 Silber bestehend; jetzt 3) Metall, enthält gediegen Gold (64) u. Silber (36); kommt in würfeligen Krystallen zackig u. in Blättchen vor; hat messinggelbe Farbe, findet sich in Sibirien,… …   Pierer's Universal-Lexikon

  • Electrum — Electrum, s. Elektrum …   Meyers Großes Konversations-Lexikon

  • electrum — [ē lek′trəm, ilek′trəm] n. [L < Gr ēlektron: see ELECTRIC] a light yellow alloy of gold and silver …   English World dictionary

  • Electrum — NOTOC Electrum is a naturally occurring alloy of gold and silver, with trace amounts of copper and other metals. Colour ranges from pale to bright yellow, depending on the proportions of gold and silver. Gold content of naturally occurring… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”