Chromium

Chromium is the 21st most abundant element in the Earth's crust. It is present at a concentration of approximately 100 ppm.Many chromium compounds are brightly colored.Chromium plays direct roles in human metabolismChromium is passivated by oxygen, forming a thin protective oxide surface layer which prevents oxidation of the underlying metal. This makes chromium suitable for a plating material. Most Chromium is obtained by mining the mineral ChromiteChromium was used in ancient times, mostly in China.

Chromium

Chromium was discovered by Louis-Nicholas Vauquelin while experimenting with a material known as Siberian red lead, also known as the mineral crocoite (PbCrO4), in 1797.Chromium was discovered by a French chemist Nicolas Louis Vauquelin in Paris.Chromium is a mineral our bodies use in small amounts for normal body functions, such as digesting food.

The atomic number of chromium is 24, while the atomic mass is 51.9961. The boiling point of Chromium is 4840°F, and the melting point is 3465°F. The element category is metal. Chromium is in period number 4 and group 6. There are 24 protons and electrons, and 28 neutrons.

Basic Info

History of the Element Chromium

Interesting Facts

Physical/Chemical Properties

How Chromium is Used

Dyes and PaintsStainless steelMetallurgyChrome platingGreen rouge metal polishMagnetic tapeHexavalent chromiumChromium trioxide

Some chemical properties are flammability, toxicity, oxidation. Some physical properties are Chromium is solid at room tempetature, it is a good conductor of heat, and it is a good conductor of electricity.