|Name, Symbol, Number||Tin, Sn, 50|
|Chemical series||True metals|
|Group, Period, Block||14 (IVA), 5 , p|
|Density, Hardness||7310 kg/m3, 1.5|
|Appearance||silvery lustrous gray|
|Atomic weight||118.710 amu|
|Atomic radius (calc.)||145 (145) pm|
|Covalent radius||141 pm|
|van der Waals radius||217 pm|
|Electron configuration||[Kr]44d10 5s2 5p2|
|e- 's per energy level||2, 8, 18, 18, 4|
|Oxidation states (Oxide)||4,2 (amphoteric)|
|State of matter||Solid|
|Melting point||505.08 K (449.47 °F)|
|Boiling point||2875 K (4716 °F)|
|Molar volume||16.29 ×1010-3 m3/mol|
|Heat of vaporization||295.8 kJ/mol|
|Heat of fusion||7.029 kJ/mol|
|Vapor pressure||5.78 E-21 Pa at 505 K|
|Speed of sound||2500 m/s at 293.15 K|
|Electronegativity||1.96 (Pauling scale)|
|Specific heat capacity||228 J/(kg*K)|
|Electrical conductivity||9.17 106/m ohm|
|Thermal conductivity||66.6 W/(m*K)|
|1st ionization potential||708.6 kJ/mol|
|2nd ionization potential||1411.8 kJ/mol|
|3rd ionization potential||2943.0 kJ/mol|
|4th ionization potential||3930.3 kJ/mol|
|5th ionization potential||7456 kJ/mol|
|Most Stable Isotopes|
|SI units & STP are used except where noted.|
|Table of contents|
8 External Links
Tin is a malleable, ductile, highly crystalline, silvery-white metal whose crystal structure causes a "tin cry" when a bar of tin is bent (caused by crystals breaking). This metal resists corrosion from distilled sea and soft tap water, but can be attacked by strong acids, alkalis, and by acid salts. Tin acts as a catalyst when oxygen is in solution and helps accelerate chemical attack.
Tin forms Sn2 is when it is heated in the presence of air. Sn2, in turn, is feebly acidic and forms stannate (tin) salts with basic oxides. Tin can be highly polished and is used as a protective coat for other metals in order to prevent corrosion or other chemical action. This metal combines directly with chlorine and oxygen and displaces hydrogen from dilute acids. Tin is malleable at ordinary temperatures but is brittle when it is heated.
Solid tin has two allotropes at normal pressure. At low temperatures it exists as gray or alpha tin, which has a cubic crystal structure similar to silicon and germanium. When warmed above that 13.2 °C it changes into white or beta tin, which is metallic and has a tetragonal structure. It slowly changes back to the gray form when cooled, which is called the tin pest or tin disease. However, this transformation is affected by impurities such as aluminum and zinc and can be prevented from occurring through the addition of antimony or bismuth.
Tin bonds readily to iron, and has been used for coating lead or zinc and steel to prevent corrosion. Tin-plated steel containers are widely used for food preservation, and this forms a large part of the market for metallic tin. Other uses;
Tin (anglo-Saxon, tin, Latin stannum) is one of the earliest metals known and was used as a component of bronze from antiquity. Because of its hardening effect on copper, tin was used in bronze implements as early as 3,500 BC. A thriving tin trade existed in Classical times between the mines in Cornwall and the civilizations of the Mediterranean. However the pure metal was not used until about 600 BC.
About 35 countries mine tin throughout the world. Nearly every continent has an important tin-mining country. Tin is produced by reducing the ore with coal in a reverberatory furnace. This metal is a relatively scarce element with an abundance in the earth's crust of about 2 ppm, compared with 94 ppm for zinc, 63 ppm for copper, and 12 ppm for lead. Most of the world's tin is produced from placer deposits; at least one-half comes from Southeast Asia. The only mineral of commercial importance as a source of tin is cassiterite (SnO2), although small quantities of tin are recovered from complex sulfides such as stanite, cylindrite, frankeite, canfieldite, and teallite. Secondary, or scrap, tin is also an important source of the tin.
Ordinary tin is made of nine stable isotopes and there are 18 unstable isotopes in addition to this that are also known.
The small amount of tin that is found in canned foods is not harmful to humans. Trialkyl and triaryl tin compounds are biocides and need to be handled with care.