What are metals?

What are metals?

1. Definition

   • humans have know about metals in prehistory. They are found as minerals in their naturale state

2. Metals throughout history

   • At first, many metal materials were used by accident, without peolpe
     • The contemporary Age----Since the 18 century---Vanadium, niobium
       • The modern Age---The 15 century---Titanium,molybdenum,tungsten,magnesium
         • The middle Ages---The 5 century---platinum,chromiun
           • Prehirtory-ancient history---Iron age,Bronze age, copper age, neolithic, mesolithic, paleolithic

3. Types of metals

   • Tungsen---3422
     • Molybdemun---2623
       • Niobium---2477
         • Vanadium---1902
           • Chromium---1857
             • Platinum---1768
               • Titanium---1668
                 • Iron---1535
                   • Cobalt---1495
                     • Nickel---1455
                       • Manganese---1245
                         • Copper---1084
                           • Gold---1064
                             • Silver---962
                               • Aluminium---660
                                 • Magnesium---650
                                   • Zinc---420
                                     • Lead---327
                                       • Tin---232
                                         • Mercury___-39

4. The general properties of metals

   • -Metals are very dense, in other words
     • -They are good heat and electricity conductors
       • -They reflect light
         • -Old metals except mercury are solid
           • -Most metals are grey or whitish colour
             • -They can be mixed with other metals and substances to impruve their properties

5. Obtaining metals

   • Minerals are non-renewable natural resources. We must therefore use them responsibly

6. The enviromental impact of extracting metals

   • Mining has a huge impact on the enviroment. However, if mining did not exist, we would not have the wide range of metals we have today