Chromium
Chromium is a solid located in period 4 and in group 6B on the periodic table of elements. Which would classify it as a transition metal. Its crystal structure is cubic and its melting point is 1857.0 degrees C (2130.15 K, 3374.6 degrees F). Chromium's Boiling point is at 2672.0 degrees C (2945.15 K, 4841.6 degrees F). Its atomic number is 24 and is a gray solid. All its stable isotopes are Cr-50, Cr-52, Cr-53, Cr-54 and its unstable are Cr-49 and Cr-51. Chromium's atomic mass is 51.9961 amu. Chromium has 24 protons and 24 electrons. It also has 28 neutrons. The atomic structure of chromium is as follows: on the first level there are 2 electrons, on the second level there are 8 electrons, on the third level there are 13 electrons, and on the fourth level there is one electron. Of Course all the protons and neutrons are in the nucleus. In the 18th century an analysis of red lead (PbCrO4, crocoite) from Siberia showe
Chromium is what gives emeralds their green color, and rubies their red color, so it is used to give glass these colors. Chromium compounds should be seen as a highly toxic in anything other than trace amounts. It is also used to anodize aluminum by the aircraft and other industry. Chromium is only found in compounds in nature. Chromium is used to harden steel, and to manufacture stainless steel. He then heated the oxide in an oven with charcoal as a reducing agent to get the metal chromium. He started by powdering the red lead and precipitated the lead out through its reaction with hydrochloric acid. Chromium compounds are important pollutants. A German chemist named Tassaert found chromium in an ore now called chromite, just a few years after Vauquelin discovered it. Louis-Nicholas Vauquelin later identified the unidentified material as chromium oxide in 1797. ------------------------------------------------------------------------**Bibliography**. Chromium III compounds are not as toxic as others. The Chromium compound chromite is used in the refractory industry for forming bricks and shapes, because of its high melting point, moderate thermal expansion, and !stable crystalline structure. This ore, Fe (CrO2) 2, is now an important source of chromium.
Common topics in this essay:
Fe CrO2,
Louis-Nicholas Vauquelin,
Cr-51 Chromium's,
,
Chromium's Boiling,
Chromium III,
Philippines Chromium,
SO2 Chromium,
Chromium VI,
USA Tasmania,
chromium found,
chromium compounds,
chromium oxide,
green color,
unidentified material,
highly toxic,
vauquelin discovered,
chromium metal,
trace amounts,
red lead,
|
Acceptance Essays
