特性

CAS Number7440-47-3
PubChem CID23976
原子半径128
モル体積7.23
原子量51.996
ブロックd
沸点2,671
Bulk Modulus
カテゴリ遷移元素
結晶構造体心立方格子
銀色
共有結合半径139
密度7.15
Electrical Resistivity
電子配置[Ar] 3d5 4s1
電子殻2, 8, 13, 1
電気陰性度1.66
Electrons24
6
融解熱20.5
蒸発熱339
イオン化エネルギー6.766
Magnetic Ordering
Magnetic Susceptibility
質量51.996
Mass Number24
融点1,907
名称クロム
中性子28
原子番号52
酸化数-2, -1, 1, 2, 3, 4, 5, 6
周期4
固体
Poisson Ratio
陽子24
Shear Modulus
熱容量0.449
記号Cr
熱伝導率0.937
Van der Waals radius
Young's Modulus
天然存在比
地殻中における存在比0.014%
宇宙空間における存在比0.0015%
Cr クロム 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. 言葉の由来は、ラテン語の silex (珪石,火打石) からきた言葉です。 24 1797 Louis-Nicholas Vauquelin France From the Greek word "chroma" meaning "colour", named for the many coloured compounds known for chromium.

ケイ素の同位体

Standard Atomic Weight

51.9961(6)

安定同位体

50Cr 52Cr 53Cr 54Cr

不安定同位体

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.