noble metals - translation to ελληνικό
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noble metals - translation to ελληνικό

METAL RESISTANT TO CORROSION AND OXIDATION IN MOIST AIR, E.G. RUTHENIUM, RHODIUM, PALLADIUM, SILVER, OSMIUM, IRIDIUM, PLATINUM, AND GOLD
Noble Metal; Noble Metals; Noble metals
  • Earth's core]]. Their abundance in [[meteoroid]] materials is relatively higher. Tellurium and selenium have been depleted from the crust due to formation of volatile hydrides.
  • § self-attacked by radiation-generated [[ozone]]}}

noble metals         
ευγενή μέταλλα
ευγενή μέταλλα         
noble metals
non metal         
  • alt=a glass tube, held upside down by some tongs, has a clear-looking ice-like plug in it which is slowly melting judging from the clear drops falling out of the open end of the tube
  • alt=A graph with a vertical electronegativity axis and a horizontal atomic number axis. The five elements plotted are O, S, Se, Te and Po. The electronegativity of Se looks too high, and causes a bump in what otherwise be a smooth curve.
  • alt=a cluster of purple crystals flanked to either side by some white crystals which themselves have a sprinkling of brown, translucent crystals on their sides
  • alt=a man kneels in one corner of a darkened room, before a glowing flask; some assistants are further behind him and discernible in the dark
  • alt=Greyish lustrous block with uneven cleaved surface.
  • alt=a cluster of bright cherry-red crystals
  • alt=A small glass jar filled with small dull grey concave buttons. The pieces of selenium look like tiny mushrooms without their stems.
  • alt=N, S and I are shown as moderately strong oxidizing agents; O, F, Cl and Br are relatively strong oxidizing agents.
CHEMICAL ELEMENTS WHICH TEND TO LOCALIZE THEIR VALENCE ELECTRONS RATHER THAN FORMING A METALLIC MATERIAL
Non-metal; Nonmetals; Non-metals; Properties of non-metals; Non metals; Non metal; Polyatomic nonmetal; Diatomic nonmetal; Active nonmetal; Less active nonmetal; Reactive nonmetal; Reactive nonmetals; Other nonmetal; Nonmetallic; Unclassified nonmetal
αμέταλλος

Ορισμός

noble metal
¦ noun Chemistry a metal (e.g. gold, silver, or platinum) that resists attack by acids and other reagents and does not corrode.

Βικιπαίδεια

Noble metal

A noble metal is ordinarily regarded as a metallic chemical element that is generally resistant to corrosion and is usually found in nature in its raw form. Gold, platinum, and the other platinum group metals (ruthenium, rhodium, palladium, osmium, iridium) are most often so classified. Silver, copper and mercury are sometimes included as noble metals, however less often as each of these usually occurs in nature combined with sulfur.

In more specialized fields of study and applications the number of elements counted as noble metals can be smaller or larger. In physics, there are only three noble metals: copper, silver and gold. In dentistry, silver is not always counted as a noble metal since it is subject to corrosion when present in the mouth. In chemistry, the term noble metal is sometimes applied more broadly to any metallic or semimetallic element that does not react with a weak acid and give off hydrogen gas in the process. This broader set includes copper, mercury, technetium, rhenium, arsenic, antimony, bismuth and polonium, as well as gold, the six platinum group metals, and silver.