خواص

CAS Number7726-95-6
PubChem CID24408
شعاع اتمی۱۲۰
حجم اتمی۲۳٫۵
عدد جرمی۷۹٫۹۰۴
بلوکp
نقطه جوش۵۸٫۸
Bulk Modulus
دستههالوژنها
ساختار کریستالیاورتورومبیک پایه محور
رنگقرمز
شعاع کووالانسی۱۲۰
چگالی۳٫۱۲۲
Electrical Resistivity
ساختار الکترونی[Ar] 3d10 4s2 4p5
الکترون های هر لایه2, 8, 18, 7
الکترونگاتیویته۲٫۹۶
Electrons35
گروه17
گرمای همجوشی۵٫۸
گرمای تبخیر۱۴٫۸
پتانسیل یونیزاسیون۱۱٫۸۱۴
Magnetic Ordering
Magnetic Susceptibility
جرم۷۹٫۹۰۴
Mass Number35
نقطه ذوب‎−۷٫۲
نامبرم
نوترون ها45
عدد اتمی80
حالات اکسید شدن-1, 1, 3, 4, 5, 7
تناوب4
جنسمایع
Poisson Ratio
پروتون ها35
Shear Modulus
ظرفیت گرمایی ویژه۰٫۴۷۴
نمادBr
رسانایی گرما۰٫۰۰۱
Van der Waals radius
Young's Modulus
فراوانی
فراوانی در پوسته زمین0.0003%
فراوانی در جهان7×10-7%
Br برم 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. از زبان یونانی'کروما': رنگی 35 1826 Antoine-J. Balard France From the Greek word "bromos" meaning "stench"

ایزوتوپ‌های کرم

Standard Atomic Weight

[79.901,79.707]

ایزوتوپ های پایدار

79Br 81Br

ایزوتوپ های ناپایدار

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.