CAESIUM - translation to αραβικά
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  1. Λεξικά
  2. Αγγλο-αραβικό λεξικό
  3. CAESIUM

CAESIUM - translation to αραβικά

CHEMICAL ELEMENT WITH SYMBOL CS AND ATOMIC NUMBER 55
Cæsium; Cesium; Element 55; Radioactive cesium poisoning; Cs (element); Caesium compound; Caesium compounds; Compounds of caesium; Radioactive caesium poisoning; Cesium compounds; Cesium compound; Compounds of cesium; Сaesium; History of caesium
  • The portion of the total radiation dose (in air) contributed by each isotope plotted against time after the [[Chernobyl disaster]]. Caesium-137 became the primary source of radiation about 200 days after the accident.<ref>Data from [https://archive.org/details/TheRadiochemicalManual The Radiochemical Manual] and Wilson, B. J. (1966) ''The Radiochemical Manual'' (2nd ed.).</ref>
  • Caesium chloride powder
  • alt=A person adds a small amount of metal to a petri dish with cold water which produces a small explosion.
  • 2}}+). Alternatively, caesium-137 may decay directly into barium-137 by a 0.4% probability beta emission.
  • alt=The stick and ball diagram shows three regular octahedra, which are connected to the next one by one surface and the last one shares one surface with the first. All three have one edge in common. All eleven vertices are purple spheres representing caesium, and at the center of each octahedron is a small red sphere representing oxygen.
  • alt=27 small grey spheres in 3 evenly spaced layers of nine. 8 spheres form a regular cube and 8 of those cubes form a larger cube. The grey spheres represent the caesium atoms. The center of each small cube is occupied by a small green sphere representing a chlorine atom. Thus, every chlorine is in the middle of a cube formed by caesium atoms and every caesium is in the middle of a cube formed by chlorine.
  • alt=Y-shaped yellowish crystal in glass ampoule, looking like the branch of a pine tree
  • bibcode=2015NatCo...6.7943S}}</ref>
  • alt=Electrons beamed from an electron gun hit and ionize neutral fuel atoms; in a chamber surrounded by magnets, the positive ions are directed toward a negative grid that accelerates them. The force of the engine is created by expelling the ions from the rear at high velocity. On exiting, the positive ions are neutralized from another electron gun, ensuring that neither the ship nor the exhaust is electrically charged and are not attracted.
  • alt=A laboratory table with some optical devices on it.
  • alt=Three middle-aged men, with the one in the middle sitting down. All wear long jackets, and the shorter man on the left has a beard.
  • alt=A white mineral, from which white and pale pink crystals protrude
  • Caesium crystals (golden) compared to [[rubidium]] crystals (silvery)
  • alt=A room with a black box in the foreground and six control cabinets with space for five to six racks each. Most, but not all, of the cabinets are filled with white boxes.

caesium         
السِّيزْيوم (العُنْصُرُ الخامِسُ والخَمْسون)
CAESIUM         

ألاسم

سيزيوم

caesium         
‎ السِّيزْيوم:العُنْصُرُ الخامِسُ والخَمْسون‎

Ορισμός

Caesium
·noun A rare alkaline metal found in mineral water;
- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic weight 132.6.
Εμφάνιση περισσότερων ορισμών

Βικιπαίδεια

Caesium

Caesium (IUPAC spelling) (or cesium in American English) is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium has physical and chemical properties similar to those of rubidium and potassium. It is pyrophoric and reacts with water even at −116 °C (−177 °F). It is the least electronegative element, with a value of 0.79 on the Pauling scale. It has only one stable isotope, caesium-133. Caesium is mined mostly from pollucite. Caesium-137, a fission product, is extracted from waste produced by nuclear reactors. It has the largest atomic radius of all elements whose radii have been measured or calculated, at about 260 picometers.

The German chemist Robert Bunsen and physicist Gustav Kirchhoff discovered caesium in 1860 by the newly developed method of flame spectroscopy. The first small-scale applications for caesium were as a "getter" in vacuum tubes and in photoelectric cells. In 1967, acting on Einstein's proof that the speed of light is the most-constant dimension in the universe, the International System of Units used two specific wave counts from an emission spectrum of caesium-133 to co-define the second and the metre. Since then, caesium has been widely used in highly accurate atomic clocks.

Since the 1990s, the largest application of the element has been as caesium formate for drilling fluids, but it has a range of applications in the production of electricity, in electronics, and in chemistry. The radioactive isotope caesium-137 has a half-life of about 30 years and is used in medical applications, industrial gauges, and hydrology. Nonradioactive caesium compounds are only mildly toxic, but the pure metal's tendency to react explosively with water means that caesium is considered a hazardous material, and the radioisotopes present a significant health and ecological hazard in the environment.

https://en.wikipedia.org/wiki/Caesium
Παραδείγματα από το σώμα κειμένου για CAESIUM
1. Tonnes of radioactive strontium, caesium, iodine, and plutonium spread across millions of miles.
2. We are finding Caesium and Strontium in breast milk and the placenta.
3. But super–accurate caesium atomic clocks get out of sync with the rotation of the Earth.
4. Levels of Caesium–137 are expected to remain high all over Europe for decades, says the United Nations.
5. Other scientists report mammals experiencing heavy doses from internally deposited Caesium–137 and Strontium–'0 radioactive fallout.
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