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metals and polymers
Member rating: No Rating | Words: 972 | Submitted: Wed May 07 2008
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Properties of materials: Metals and Polymers. When a metal is in its purest form it is made of ions that are held in place by metallic bonds. Covalent and ionic bonding is different to metallic as the outer shells of adjacent atoms overlap. This then lets the outer shell electrons to move about freely through the lattice in the electron cloud. diagram of an electon cloud Metals atoms have to have a positive charged nucleus and also have negative charged electrons outside. The atom will lose its outer electrons when it is in its solid state. The bonding electrons spread thought the lattice and become delocalised this is because the bonding electrons no longer belong to any particular metal atom. Delocalised means that it is not restricted to one part of the lattice. Metallic bonds are formed when positive metal ions are attracted to the negative charged electrons which lies in the...
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