欧美三区美女,亚洲人成午夜免电影费观看,亚洲综合一区二区三区,神马久久资源

Physical Properties of Tungsten

These are some of the physical properties of tungsten:

Atomic Atomic Mass: 183.85 Successive Ionization Energies:
Electronegativity: W -? W + : 770 kJ mol-1
Pauling: 2.36 W+1 -? W+2 : (1700) kJ mol-1
Allred: 1.4 W+2 -? W+3 : (2300) kJ mol-1
Absolute: 4.4 eV W+3 -? W+4 : (3400) kJ mol-1
Electron Affinity: 78.6 kJ mol-1 W+4 -? W+5 : (4600) kJ mol-1
Polarizability: 11.1 ?3 W+5 -? W+6 : (5900) kJ mol-1
Effective Nuclear Charge: Common Ions
Slater: 4.35  
Clementi: 9.85  
Froese Fischer: 14.22  
Radius:  
W 4 +: 68 pm  
W 6 +: 62 pm  
Atomic: 137 pm  
Covalent: 130 pm  

The metal is obtained commercially be recucing tungsten oxide with hydrogen or carbon. Pure tungsten is a stelel-gray to tin-white metal. Very pure tungsten can be cut with a hacksaw, and can be forged, spun, drawn, and extruded. The impure metal is brittle and can be worked only with difficulty. Tungsten has the highest melting point of all metals, and at temperatures over 1650C has the highest tensile strength. The metal oxidizes in air and must be protected at elevated temperatures.It has excellent corrosion resistance and is attacked only slightly by most mineral acids.

主站蜘蛛池模板: 高密市| 宜丰县| 太白县| 集贤县| 长丰县| 天水市| 兴宁市| 大兴区| 永城市| 南平市| 永登县| 昌乐县| 申扎县| 松滋市| 二手房| 内江市| 合肥市| 福安市| 邓州市| 迁安市| 正镶白旗| 青河县| 永定县| 汨罗市| 德钦县| 紫金县| 南溪县| 敦煌市| 永兴县| 福州市| 浏阳市| 霍林郭勒市| 仪陇县| 新野县| 钦州市| 东港市| 安图县| 阳城县| 穆棱市| 云林县| 琼海市|