Özellikler

CAS Number7440-47-3
PubChem CID23976
Atom yarıçapı128
Atomik Hacim7,23
Atom ağırlığı51,996
Blokd
Kaynama noktası2.671
Bulk Modulus
KategoriGeçiş metalleri
Kristal yapısıHacim merkezli kübik
RenkGümüşi
Kovalent yarıçapı139
Yoğunluk7,15
Electrical Resistivity
Elektron dizilimi[Ar] 3d5 4s1
Enerji seviyesi başına Elektronlar2, 8, 13, 1
Elektronegatifliği1,66
Electrons24
Grup6
Ergime ısısı20,5
Buharlaşma ısısı339
İyonlaşma enerjisi6,766
Magnetic Ordering
Magnetic Susceptibility
Kütle51,996
Mass Number24
Ergime noktası1.907
İsimKrom
Nötronlar28
Atom numarası52
Yükseltgenme seviyeleri-2, -1, 1, 2, 3, 4, 5, 6
Periyot4
FazKatı
Poisson Ratio
Protonlar24
Shear Modulus
Isı kapasitesi0,449
SembolCr
Isıl iletkenlik0,937
Van der Waals radius
Young's Modulus
Bulunabilirlik
Dünya kabuğundaki bulunulabilirliği0.014%
Evrendeki bulunulabilirliği0.0015%
Cr Krom 24 51.9961 6 4 d 24 1857.0 2672.0 [Ar] 3d5 4s1 2 8 13 1 7.19 0.014% Silver Cubic: Body centered 1.7 1.65 {"1":"652.9","2":"1590.6","3":"2987","4":"4743","5":"6702","6":"8744.9","7":"15455","8":"17820","9":"20190","10":"23580","11":"26130","12":"28750","13":"34230","14":"37066","15":"97510","16":"105800","17":"114300","18":"125300","19":"134700","20":"144300","21":"157700","22":"166090","23":"721870","24":"761733"} 653 64.3 127 +3,2,6 1.3 7.23 20.0 339.5 0.449 93.7 393.K 0 Solid, Antiferromagnetic, Conductor, TransitionMetal, Metal, Stable, Natural KROH-mi-em Very hard, crystalline, steel-gray metal. The pure metal has a blue-white color. It is hard, brittle and corrsion-resistant at normal temperatures. Used to make stainless steel. It gives the color to rubies and emeralds. Iron-nickel-chromium alloys in various percentages yield an incredible variety of the most important metals in modern technology. Chromite [Fe,Mg(CrO4)] is its most important mineral. Produced commercially by heating its ore in the presence of silicon or aluminium. lzRb4zmGvNU Chromium
In 1800, Sir Humphry Davy thought silica to be a compound and not an element; but in 1811, Gay Lussac and Louis Jacques Thénard probably prepared impure amorphous silicon by heating potassium with silicon tetrafluoride.

In 1824 Jöns Jakob Berzelius prepared amorphous silicon by the same general method.

Henri Deville in 1854 first prepared crystalline silicon, the second allotropic form of the element. From the Latin word silex, silicis, flint 24 1797 Louis-Nicholas Vauquelin France From the Greek word "chroma" meaning "colour", named for the many coloured compounds known for chromium.

Silisyum izotopları

Standard Atomic Weight

51.9961(6)

Kararlı izotoplar

50Cr 52Cr 53Cr 54Cr

Kararsız izotoplar

42Cr 43Cr 44Cr 45Cr 46Cr 47Cr 48Cr 49Cr 51Cr 55Cr 56Cr 57Cr 58Cr 59Cr 60Cr 61Cr 62Cr 63Cr 64Cr 65Cr 66Cr 67Cr

If breathed in as a fine silica/silicate dust, it may cause chronic respiratory problems
Silicon also has the unusual property that it expands as it freezes
In the form of sand and clay it is used to make concrete and brick; it is a useful refractory material for high-temperature work, and in the form of silicates it is used in making enamels, pottery, etc.

Silica, as sand, is a principal ingredient of glass.

Silicon chips are the basis of modern electronic and computing.

Silicon carbide, more commonly called carborundum is used in abrasives.