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(hexagonal close-packed structure)

См. также в других словарях:

  • Hexagonal compact — Empilement compact L empilement compact est la manière d agencer des sphères dans l espace afin d avoir la plus grande densité de sphères, sans que celles ci ne se recouvrent. C est un problème que l on se pose en général en géométrie euclidienne …   Wikipédia en Français

  • Periodic table (crystal structure) — The structures of metallic elements adopted at normal temperatures are colour coded and shown below Greenwood Earnshaw] , the only exception is mercury, Hg, which is a liquid and the structure refers to the low temperature form. The melting… …   Wikipedia

  • Crystal structure — In mineralogy and crystallography, crystal structure is a unique arrangement of atoms or molecules in a crystalline liquid or solid. A crystal structure is composed of a pattern, a set of atoms arranged in a particular way, and a lattice… …   Wikipedia

  • Samarium — promethium ← samarium → europium ↑ Sm ↓ …   Wikipedia

  • Aluminium oxide — Alumina redirects here. For the company, see Alumina Limited. This article is about aluminium(III) oxide Al2O3. For other uses, see Aluminium oxide (disambiguation). Aluminium oxide …   Wikipedia

  • zinc — zincky, zincy, zinky, adj. zincoid, adj. /zingk/, n., v., zincked or zinced /zingkt/, zincking or zincing /zing king/. n. 1. Chem. a ductile, bluish white metallic element: used in making galvanized iron, brass, and other alloys, and as an… …   Universalium

  • dysprosium — /dis proh see euhm, shee /, n. Chem. a rare earth metallic element, highly reactive and paramagnetic, found in small amounts in various rare earth minerals, as euxenite and monazite: used to absorb neutrons in nuclear reactors. Symbol: Dy; at. wt …   Universalium

  • technetium — /tek nee shee euhm, sheuhm/, n. Chem. an element of the manganese family, not found in nature, but obtained in the fission of uranium or by the bombardment of molybdenum. Symbol: Tc; at. wt.: 99; at. no.: 43; sp. gr.: 11.5. [1945 50; < Gk… …   Universalium

  • terbium — terbic, adj. /terr bee euhm/, n. Chem. a rare earth, metallic element present in certain minerals and yielding colorless salts. Symbol: Tb; at. no.: 65; at. wt.: 158.924; sp. gr.: 8.25. [1835 45; (Yt)terb(y), name of Swedish town where found +… …   Universalium

  • zirconium — zirconic /zerr kon ik/, adj. /zerr koh nee euhm/, n. Chem. a metallic element found combined in zircon, baddeleyite, etc., resembling titanium chemically: used in steel metallurgy, as a scavenger, as a refractory, and as an opacifier in vitreous… …   Universalium

  • Iddingsite — is an alteration of olivine that consists of a mixture of clay minerals, iron oxides and ferrihydrides. Iddingsite forms from the weathering of basalt in the presence of liquid water and can be described as a phenocryst meaning it has… …   Wikipedia

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