Atomic NumberAtomic Number of Chromium
Atomic Number of Chromium is 24.
Chemical symbol for Chromium is Cr. Number of protons in Chromium is 24. Atomic weight of Chromium is 51.9961 u or g/mol. Melting point of Chromium is 1857 °C and its the boiling point is 2482 °C.
» Boiling Point » Melting Point » Abundant » State at STP » Discovery YearAbout Chromium
Chromium is a metal of a silvery-blue color and quite toxic. It has got its name after the Greek word ‘chroma’ which means color. This chemical element can be mainly found in chromites, and it is used as an element of alloys like the one with steel, to produce very strong metal. In very small doses, chromium is vital for living organisms as it helps glucose digestion. But in large doses chromium is very toxic. The most popular industrial use of chromium is producing mirrors and stainless steel. There is a large number of chromium plated parts produced to be used in automobile, construction, and other industries.
Uses of Chromium
Chromium, hard, steel-gray metal with the symbol Cr, is mainly used in stainless steel production. Ferrochromium, a compound with chromium and iron, is mostly used in the production of stainless steel. Chromium is also alloyed with nickel and iron, as well as used as a pigment for glass, paint, glazes. Chromite is mainly used as a refractory, because of its heat stability. Nichrome, an alloy with nickel and chrome, is used for heating units because of its high heat resistance. Chromium compounds can also be used as industrial catalysts too. Chromic acid is used in chromium plating, ceramics, and colored glass.
Compounds with Chromium
- FeCr: Ferrochrome (Ferrochromium)
- Cr2O3: Chromium sesquioxide
- Na2Cr2O7: Sodium dichromate
- CrF6: Chromium hexafluoride
- FeCr2O4: Chromite
- CrO3: Chromium oxide
- CrO5: Chromium peroxide
- H2CrO4: Chromic acid
Properties of Chromium Element
| Atomic Number (Z) | 24 |
|---|---|
| Atomic Symbol | Cr |
| Group | 6 |
| Period | 4 |
| Atomic Weight | 51.9961 u |
| Density | 7.15 g/cm3 |
| Melting Point (K) | 2180 K |
| Melting Point (℃) | 1857 °C |
| Boiling Point (K) | 2944 K |
| Boiling Point (℃) | 2482 °C |
| Heat Capacity | 0.449 J/g · K |
| Abundance | 102 mg/kg |
| State at STP | Solid |
| Occurrence | Primordial |
| Description | Transition metal |
| Electronegativity (Pauling) χ | 1.66 |
| Ionization Energy (eV) | 6.7665 |
| Atomic Radius | 140pm |
| Covalent Radius | 127pm |
| Valence Electrons | 1 |
| Year of Discovery | 1797 |
| Discoverer | Vauquelin |