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The Element Chromium


"The Atom"

Definition of the Chromium Element
A lustrous, hard, steel-gray metallic element, resistant to tarnish and corrosion and found primarily in chromite. It is used in the hardening of steel alloys and the production of stainless steels, in corrosion-resistant decorative platings, and as a pigment in glass. Chromium does not tarnish in air, when heated it borns and forms the green chromic oxide. The Atomic Number of this element is 24 and the Element Symbol is Cr.

The Properties of the Chromium Element
Symbol of Element : Cr
Atomic Number : 24
Atomic Mass: 51.9961 amu
Melting Point: 1857.0 °C - 2130.15 °K
Boiling Point: 2672.0 °C - 2945.15 °K
Number of Protons/Electrons: 24
Number of Neutrons : 28
Crystal Structure: Cubic
Density @ 293 K: 7.19 g/cm3
Color: steel-gray

What is Chromium? Origin / Meaning of the name Chromium
The name originates from the Greek word chroma meaning color

What is Chromium? Periodic Table Group and Classification of the Chromium Element
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. Chromium is classified as a "Transition Metal" which are located in Groups 3 - 12 of the Periodic Table. Elements classified as Transition Metals are generally described as ductile, malleable, and able to conduct electricity and heat. Nearly 75% of all the elements in the Periodic Table are classified as metals which are detailed in the List of Metals.

Facts about the History and the Discovery of the Chromium Element
Chromium was discovered by Louis Vauquelin in 1797 who was also able to detect traces of chromium in precious gems, such as ruby and emerald. Nicolas-Louis Vauquelin also discovered Beryllium. Nicolas-Louis Vauquelin rose from being born as the son of a peasant to an eminent chemist. He started his career working in an apothocary shop and then he became the laboratory assistant of Antoine-François Fourcroy before becoming an authority in his own right eventually chemistry professor at the Paris Faculty of Medicine.

Occurrence of the Chromium Element
Occurrence of Chromium. The ore from which all chromium compounds are made is chromite, or chrome iron ore (FeCr2O4). The element also occurs in small quantities in many other minerals, especially in crocoisite (PbCrO4), in which mineral it was first discovered.

Preparation of Chromium
Chromium, like manganese, is very hard to reduce from its ores, owing to its great affinity for Oxygen. It can, however, be made by the same methods which have proved successful with manganese. Considerable quantities of an alloy of chromium with iron, called ferrochromium, are now produced for the steel industry.

Abundances of the element in different environments
% in Universe 0.0015%
% in Sun 0.002%
% in Meteorites 0.3%
% in Earth's Crust 0.014%
% in Oceans 6×10-8%
% in Humans 3×10-6%

Associated Uses of Chromium
Dyes and paints
Stainless steel
Chrome plating
Green rouge metal polish
Magnetic tape
Hexavalent chromium
Chromium trioxide 30.0 /day

The Properties of the Chromium Element
Properties. Chromium is a very hard metal of about the same density as iron. It is one of the most infusible of the metals, requiring a temperature little short of 3000° for fusion. At ordinary temperatures air has little action on it; at higher temperatures, however, it burns brilliantly.

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