Zinc | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Zinc


00:02:55 1 Characteristics
00:03:05 1.1 Physical properties
00:04:44 1.2 Occurrence
00:07:22 1.3 Isotopes
00:09:26 2 Compounds and chemistry
00:09:36 2.1 Reactivity
00:12:05 2.2 Zinc(I) compounds
00:12:57 2.3 Zinc(II) compounds
00:14:58 2.4 Test for zinc
00:15:33 3 History
00:15:42 3.1 Ancient use
00:18:24 3.2 Early studies and naming
00:20:18 3.3 Isolation
00:21:58 3.4 Later work
00:23:53 4 Production
00:24:02 4.1 Mining and processing
00:26:56 4.2 Environmental impact
00:28:52 5 Applications
00:29:17 5.1 Anti-corrosion and batteries
00:31:31 5.2 Alloys
00:34:35 5.3 Other industrial uses
00:37:29 5.4 Organic chemistry
00:39:51 5.5 Dietary supplement
00:41:42 5.5.1 Common cold
00:43:01 5.6 Topical use
00:43:36 6 Biological role
00:46:13 6.1 Enzymes
00:47:41 6.2 Signalling
00:48:02 6.3 Other proteins
00:49:53 6.4 Dietary recommendations
00:52:31 6.5 Dietary intake
00:54:03 6.6 Deficiency
00:57:07 6.7 Soil remediation
00:57:27 6.8 Agriculture
00:58:24 7 Precautions
00:58:33 7.1 Toxicity
01:01:14 7.2 Poisoning
01:02:27 8 See also



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SUMMARY
=======
Zinc is a chemical element with symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. Zinc is the 24th most abundant element in Earth's crust and has five stable isotopes. The most common zinc ore is sphalerite (zinc blende), a zinc sulfide mineral. The largest workable lodes are in Australia, Asia, and the United States. Zinc is refined by froth flotation of the ore, roasting, and final extraction using electricity (electrowinning).
Brass, an alloy of copper and zinc in various proportions, was used as early as the third millennium BC in the Aegean, Iraq, the United Arab Emirates, Kalmykia, Turkmenistan and Georgia, and the second millennium BC in West India, Uzbekistan, Iran, Syria, Iraq, and Israel (Judea). Zinc metal was not produced on a large scale until the 12th century in India, though it was known to the ancient Romans and Greeks. The mines of Rajasthan have given definite evidence of zinc production going back to the 6th century BC. To date, the oldest evidence of pure zinc comes from Zawar, in Rajasthan, as early as the 9th century AD when a distillation process was employed to make pure zinc. Alchemists burned zinc in air to form what they called "philosopher's wool" or "white snow".
The element was probably named by the alchemist Paracelsus after the German word Zinke (prong, tooth). German chemist Andreas Sigismund Marggraf is credited with discovering pure metallic zinc in 1746. Work by Luigi Galvani and Alessandro Volta uncovered the electrochemical properties of zinc by 1800. Corrosion-resistant zinc plating of iron (hot-dip galvanizing) is the major application for zinc. Other applications are in electrical batteries, small non-structural castings, and alloys such as brass. A variety of zinc compounds are commonly used, such as zinc carbonate and zinc gluconate (as dietary supplements), zinc chloride (in deodorants), zinc pyrithione (anti-dandruff shampoos), zinc sulfide (in luminescent paints), and zinc methyl or zinc diethyl in the organic laboratory.
Zinc is an essential mineral, including to prenatal and postnatal development. Zinc deficiency affects about two billion people in the developing world and is associated with many diseases. In children, deficiency causes growth retardation, delayed sexual maturation, infection susceptibility, and diarrhea. Enzymes with a zinc atom in the reactive center are widespread in biochemistry, such as alcohol dehydrogenase in humans. Consumption of excess zinc can cause ataxia, lethargy, and copper deficiency.