METALS

METALS

1. The majority of elements in the periodic table.Minerals in natural state. Used since prehistory

2. TYPES OF METALS

   • Seven metal since ancient times
     • iron , copper, silver , tin, gold, mercury , lead
   • Alloys:combination of elements atleast one metal
     • Bronze,brass,steel,stainless steal

3. PROPERTIES OF METALS

   • dense
   • good conductors
   • reflect light
   • solid except mercury
   • grey or whitish coloured
   • mixable

4. OBTAINING METALS

   • mining and metallurgy
     • open pit mines
     • underground mines

5. ENVIROMENTAL PROBLEMS

   • Mining spoils the landscape
   • It alters the soil structure
   • Blasting produces smoke and dust
   • Sound polution
   • toxic processes

6. METALWORKING TOOLS

   • Drilling tools
     • Drills
     • Drill bits
     • Punches
   • Filing tools
     • Grinders or emery grinders
     • Files
     • Sandpaper
   • Cutting tools
     • A hacksaw, snips, shears, a jigsaw, an angle grinder

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