TECH 31065 Study Guide - Summer 2018, Comprehensive Midterm Notes - Steel, Tungsten, Sulfur
12 Oct 2018
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Document Summary
A short history of metals: currently 86 known metals, before the 19th century only 24 were known, 12 were discovered in the 18th century. Metals of antiquity: metals of antiquity- oldest known metals, upon which civilization is based, gold (6000 bc, copper (4200 bc, silver (4000 bc, lead (3500 bc, tin (1750 bc) Iron (1500 bc smelted: mercury (750 bc, known to the mesopotamians, egyptians, greeks, romans, the chinese, and in india, five can be found in their native states, gold, silver, copper. Iron (from meteors: mercury, gold and copper were the first metals to be widely used, 3300 bc- copper is the first metal to be cast in mesopotamia, gold, silver. The rest of the metals: fermium, mendelevium, nobelium* Lawrencium: 1878 holmium, 1879 thulium, 1880 scandium, 1881 samarium, 1882 gadolinium, 1883 praseodymium, 1884 neodymium, 1885 dysprosium, 1886 germanium, 1898 polonium, radium, 1899 actinium, 1901 europium, 1907 lutetium, californium, einsteinium* *** all elements are synthetic and do not occur naturally.
