Svojstva

CAS broj7726-95-6
PubChem CID24408
Atomski radijus120
Atomski volumen23,5
Relativna atomska masa79,904
Blokp
Vrelište58,8
Modul stišljivosti
KategorijaHalogeni elementi
Kristalna strukturaBazno centrirana ortorombična
BojaCrvena
Kovalentni radijus120
Gustoća3,122
Električna otpornost
Elektronska konfiguracija[Ar] 3d10 4s2 4p5
Elektrona po ljusci2, 8, 18, 7
Elektronegativnost2,96
Elektroni35
Skupina17
Toplina taljenja5,8
Toplina isparavanja14,8
Potencijal ionizacije11,814
Magnetsko redanje
Magnetska osjetljivost
Masa79,904
Maseni broj35
Talište-7,2
NazivBrom
Neutroni45
Atomski broj80
Stanja oksidacije-1, 1, 3, 4, 5, 7
Perioda4
Agregacijsko stanjeTekuće
Poissonov omjer
Protoni35
Modul smicanja
Specifični toplinski kapacitet0,474
SimbolBr
Toplinska vodljivost0,001
Van der Waalsov radijus
Youngov modul
Obilnost
Zastupljenost u Zemljinoj kori0.0003%
Zastupljenost u svemiru7×10-7%
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
1797., Louis Nicolas Vauquelin je dobio uzorke rude krokoita.

1798., Vauquelin je otkrio da može izolirati metalni krom zagrijavanjem njegovog oksida u peći na ugljen, što ga čini otkrivačem tog elementa.

Vauquelin je uspio i detektirati tragove kroma u dragom kamenju, kao što su rubini i smaragdi. Od grčke riječi chroma, boja 35 1826 Antoine-J. Balard France From the Greek word "bromos" meaning "stench"

Isotopes of Chromium

Standard Atomic Weight

[79.901,79.707]

Stabilni izotopi

79Br 81Br

Nestabilni izotopi

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.