Physical And Chemical Properties Of Cadmium Pdf

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physical and chemical properties of cadmium pdf

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Cadmium Cd , chemical element , a metal of Group 12 IIb, or zinc group of the periodic table. Silver-white and capable of taking a high polish, cadmium is nearly as soft as tin and, like tin, emits a crackling sound when bent; it can be rolled out into sheets. Cadmium melts and boils at relatively low temperatures; its vapour is deep yellow and monatomic. The metal is permanent in dry air, becomes coated with the oxide in moist air, burns on heating to redness, and is readily soluble in mineral acids. Poisoning results from the inhalation of vapour or dust of cadmium. Friedrich Stromeyer, a German chemist, discovered the element in a sample of zinc carbonate, and, in the same year, K. Hermann and J.

Cadmium - Cd

This chapter presents a series of short discussions of many metals. It contains a tabulation of major health effects, physical properties and physical and chemical hazards associated with these metals and many of their compounds see table Not every metal is covered in this chapter. Cobalt and beryllium, for example, appear in the chapter Respiratory system. Other metals are discussed in more detail in articles that present information on the industries in which they predominate.

Cadmium is a chemical element with the symbol Cd and atomic number This soft, silvery-white metal is chemically similar to the two other stable metals in group 12 , zinc and mercury. Cadmium and its congeners in group 12 are often not considered transition metals, in that they do not have partly filled d or f electron shells in the elemental or common oxidation states. The average concentration of cadmium in Earth's crust is between 0. It was discovered in simultaneously by Stromeyer and Hermann , both in Germany, as an impurity in zinc carbonate. Cadmium occurs as a minor component in most zinc ores and is a byproduct of zinc production.

Cd, Element 48, [] Cadmium is a metallic element in the second Download entry PDF Cadmium, Physical and Chemical Properties, Table 1.

Cadmium, Physical and Chemical Properties

Cadmium is a lustrous, silver-white, ductile, very malleable metal. Its surface has a bluish tinge and the metal is soft enough to be cut with a knife, but it tarnishes in air. It is soluble in acids but not in alkalis. It is similar in many respects to zinc but it forms more complex compounds.

Cd, Element 48, []. Cadmium Cd, atomic weight, One mineral form, greenockite CdS , is significant, but the usual Cd source is the oxide in industrial slag associated with the refining of Zn or Pb. The industrial uses of Cd include anticorrosion coatings, nickel-cadmium rechargeable batteries, and in neutron moderating alloys. Cadmium sulfide is used as a bright yellow pigment, and all cadmium chalcogenides CdS, CdSe, CdTe are used in semiconductor, photonic, and nanoparticle materials and for research. Skip to main content Skip to table of contents.

Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. The toxicity of zinc, its interaction with cadmium, and the toxicity of copper and silver are discussed in Appendix D. This chapter reviews the physical and chemical properties, toxicokinetics, and toxicity of cadmium and cadmium compounds.

Allotropes Some elements exist in several different structural forms, called allotropes. Each allotrope has different physical properties. For more information on the Visual Elements image see the Uses and properties section below. Group A vertical column in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell. Period A horizontal row in the periodic table. The atomic number of each element increases by one, reading from left to right.

Property, Cadmium, Cadmium carbonate. Molecular weight, , Color, Silver-white, White. Physical state, Lustrous metal, Powder or rhombohedral.

Chemistry in its element: cadmium

Понятно, домой он так и не ушел и теперь в панике пытается что-то внушить Хейлу. Она понимала, что это больше не имеет значения: Хейл и без того знал все, что можно было знать. Мне нужно доложить об этом Стратмору, - подумала она, - и как можно скорее. ГЛАВА 38 Хейл остановился в центре комнаты и пристально посмотрел на Сьюзан. - Что случилось, Сью. У тебя ужасный вид.

 - Он еще раз оглядел комнату. - Вас подбросить в аэропорт? - предложил лейтенант - Мой Мото Гуччи стоит у подъезда. - Спасибо, не стоит. Я возьму такси.  - Однажды в колледже Беккер прокатился на мотоцикле и чуть не разбился. Он больше не хотел искушать судьбу, кто бы ни сидел за рулем.

 Не может быть? - повторил он, сохраняя ледяной тон.  - Может, пройдем, чтобы я смог вам это доказать. - Не стану вас затруднять, - ухмыльнулась она, - благодарю за предложение. Но все же кто .

Упираясь ногами в толстый ковер, Сьюзан начала изо всех сил толкать стол в направлении стеклянной двери. Ролики хорошо крутились, и стол набирал скорость. Уже на середине комнаты она основательно разогналась. За полтора метра до стеклянной двери Сьюзан отпрянула в сторону и зажмурилась. Раздался страшный треск, и стеклянная панель обдала ее дождем осколков.

Сьюзан замерла. Мгновение спустя, как в одном из самых страшных детских кошмаров, перед ней возникло чье-то лицо.


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