Tin, the metal element, low melting point metal element, a bluish white luster, in the compound is two valence or tetravalent, will not be air oxidation, mainly carbon dioxide (cassiterite) and various sulfides (such as Liu Xishi) form. Element symbol Sn. Tin is the famous "hardware" - one of gold, silver, copper, iron, tin. As early as in ancient times, people discovered and used tin. A number of ancient tombs in China, they often find some tin pot, like tin tin candlestick. According to research, China's Zhou Dynasty, the use of tin has been very common. In the ancient tombs of Egypt, tin was also found in daily necessities.
Tin, English name Tin (Stannum), element Sn, metal belonging to the IVA family, atomic number 50, the relative atomic mass of 118.71, a group IVA metal, melting point: 231.89 C, 2260 C, boiling point, density: 7.28g/cm fand. Tin is a silver white metallic luster of the low melting point of the metal, pure tin soft, good at room temperature, good chemical stability, not easy to be oxidized, often keep the silver shiny luster. The content of tin in the crust is 0.004%, almost all in cassiterite (SnO2) form, in addition to a very small amount of tin sulfide ore. As one of "hardware" (gold, silver, copper, iron, tin), as early as the 2000 BC, tin has begun to be used by humans. At present, mainly used in the manufacture of tin solder, tin plate, alloy, chemical products, products are widely used in electronics, electrical appliances, information, chemical industry, metallurgy, building materials, food packaging, machinery, atomic energy and aerospace industry and other industries.
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