Krom
24
Cr
Grup
6
Periyot
4
Blok
d
Protonlar
Elektronlar
Nötronlar
24
24
28
Temel Özellikleri
Atom numarası
24
Atom ağırlığı
51,9961
Kütle Numarası
52
Kategori
Geçiş metalleri
Renk
Gümüşi
Radyoaktif
Hayir
From the Greek word chroma, color
Kristal yapısı
Hacim merkezli kübik
Tarihi
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.
Enerji seviyesi başına Elektronlar
2, 8, 13, 1
Elektron dizilimi
[Ar] 3d5 4s1
Chromium oxide was used by the Chinese in the Qin dynasty over 2,000 years ago
Fiziksel Özellikleri
Faz
Katı
Yoğunluk
7,15 g/cm3
Ergime noktası
2180,15 K | 1907 °C | 3464,6 °F
Kaynama noktası
2944,15 K | 2671 °C | 4839,8 °F
Ergime ısısı
20,5 kJ/mol
Buharlaşma ısısı
339 kJ/mol
Isı kapasitesi
0,449 J/g·K
Dünya kabuğundaki bulunulabilirliği
0,014%
Evrendeki bulunulabilirliği
0,0015%
Resim kaynağı: 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 Numarası
7440-47-3
PubChem CID Numarası
23976
Atom Özellikleri
Atom yarıçapı
128 pm
Kovalent yarıçapı
139 pm
Elektronegatifliği
1,66 (Pauling ölçeği)
İyonlaşma enerjisi
6,7665 eV
Atomik Hacim
7,23 cm3/mol
Isıl iletkenlik
0,937 W/cm·K
Yükseltgenme seviyeleri
-2, -1, 1, 2, 3, 4, 5, 6
Uygulamalar
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
İzotoplar
Kararlı izotoplar
50Cr, 52Cr, 53Cr, 54CrKararsız izotoplar
42Cr, 43Cr, 44Cr, 45Cr, 46Cr, 47Cr, 48Cr, 49Cr, 51Cr, 55Cr, 56Cr, 57Cr, 58Cr, 59Cr, 60Cr, 61Cr, 62Cr, 63Cr, 64Cr, 65Cr, 66Cr, 67Cr