Xrom
24
Cr
Guruh
6
Davr
4
Block
d
Protonlar
Elektronlar
Neytronlar
24
24
28
General Properties
Atom raqami
24
Atom massasi
51,9961
Mass Number
52
Turkum
Oʻtish metallar
Ranggi
Silver
Radioaktivlik
Yoʻq
From the Greek word chroma, color
Crystal Structure
Body Centered Cubic
Tarix
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.
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.
Electrons per shell
2, 8, 13, 1
Elektron konfiguratsiyasi
[Ar] 3d5 4s1
Chromium oxide was used by the Chinese in the Qin dynasty over 2,000 years ago
Physical Properties
Phase
Qattiq modda
Zichlik
7,15 g/cm3
Erish harorati
2180,15 K | 1907 °C | 3464,6 °F
Qaynash harorati
2944,15 K | 2671 °C | 4839,8 °F
Heat of Fusion
20,5 kJ/mol
Heat of Vaporization
339 kJ/mol
Solishtirma issiqlik sigʻimi
0,449 J/g·K
Abundance in Earth's crust
0,014%
Abundance in Universe
0,0015%
Image Credits: Wikimedia Commons (Alchemist-hp)
High purity chromium crystals, produced by chemical transport reaction through decomposition of chromium iodides, as well as a high purity chromium cube for comparison
CAS Number
7440-47-3
PubChem CID Number
23976
Atomic Properties
Atom radiusi
128 pm
Kovalentlik radiusi
139 pm
Elektrmanfiylik
1,66 (Poling boʻyicha)
Ionization Potential
6,7665 eV
Molyar hajm
7,23 cm3/mol
Issiqlik oʻtkazuvchanlik
0,937 W/cm·K
Oksidlanish darajasi
-2, -1, 1, 2, 3, 4, 5, 6
Applications
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.
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.
In larger amounts, chromium can be toxic and carcinogenic
Izotoplar
Barqaror izotoplar
50Cr, 52Cr, 53Cr, 54CrBeqaror izotoplar
42Cr, 43Cr, 44Cr, 45Cr, 46Cr, 47Cr, 48Cr, 49Cr, 51Cr, 55Cr, 56Cr, 57Cr, 58Cr, 59Cr, 60Cr, 61Cr, 62Cr, 63Cr, 64Cr, 65Cr, 66Cr, 67Cr