Proprietăți

CAS Number7726-95-6
PubChem CID24408
Rază atomică120
Volum molar23,5
Masă atomică79,904
Blocp
Punct de fierbere58,8
Bulk Modulus
CategorieHalogeni
Structură cristalinăBază Centrată Ortorombic
CuloareRoșu
Rază de covalență120
Densitate3,122
Electrical Resistivity
Configurație electronică[Ar] 3d10 4s2 4p5
Electroni pe nivelul de energie2, 8, 18, 7
Electronegativitate2,96
Electrons35
Grupă17
Energie de fuziune5,8
Energie de evaporare14,8
Potențial de ionizare11,814
Magnetic Ordering
Magnetic Susceptibility
Masa79,904
Mass Number35
Punct de topire-7,2
NumeBrom
Neutroni45
Număr atomic80
Număr de oxidare-1, 1, 3, 4, 5, 7
Perioadă4
FazăLichid
Poisson Ratio
Protoni35
Shear Modulus
Căldură specifică0,474
SimbolBr
Conductivitate termică0,001
Van der Waals radius
Young's Modulus
Abundență naturală
Abundența în scoarța Pământului0.0003%
Abundența în Univers7×10-7%
Br Brom 35 79.904 17 4 p 35 -7.2 58.8 [Ar] 4s2 3d10 4p5 2 8 18 7 3.12 0.0003% Red Orthorhombic 3.0 2.685 {"1":"1139.9","2":"2103","3":"3470","4":"4560","5":"5760","6":"8550","7":"9940","8":"18600"} 1140 324.6 114 ±1,+5 1.12 23.5 5.286 14.725 0.226 0.122 0 Liquid, Diamagnetic, Insulator, Halogen, Nonmetal, Stable, Natural BRO-meen Redish-brown liquid. It was once used in large quantities to make a compound that removed lead compound build up in engines burning leaded gasoline. Now it is primarily used in dyes, disinfectants, and photographic chemicals. Occurs in compounds in sea water. Slt3_5upuSs Bromine
In 1797, Louis Nicolas Vauquelin received samples of crocoite ore.

In 1798, Vauquelin discovered that he could isolate metallic chromium by heating the oxide in a charcoal oven, making him the discoverer of the element.

Vauquelin was also able to detect traces of chromium in precious gemstones, such as ruby or emerald. Din cuvântul grecesc chroma, culoare 35 1826 Antoine-J. Balard France From the Greek word "bromos" meaning "stench"

Isotopes of Chromium

Standard Atomic Weight

[79.901,79.707]

Izotopi stabili

79Br 81Br

Izotopi instabili

67Br 68Br 69Br 70Br 71Br 72Br 73Br 74Br 75Br 76Br 77Br 78Br 80Br 82Br 83Br 84Br 85Br 86Br 87Br 88Br 89Br 90Br 91Br 92Br 93Br 94Br 95Br 96Br 97Br

In larger amounts, chromium can be toxic and carcinogenic
Chromium oxide was used by the Chinese in the Qin dynasty over 2,000 years ago
Chromium is used to harden steel, manufacture stainless steel, and form many useful alloys.

It is mostly used in plating to produce a hard, beautiful surface and to prevent corrosion.

The metal is also widely used as a catalyst.

Chromium compounds are valued as pigments for their vivid green, yellow, red and orange colors.