Structure and Bonding

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  • Created by: Sophie
  • Created on: 05-12-14 16:32
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  • Structure and Bonding
    • Ionic bonding
      • Between a metal and a non-metal
      • Ions (charged atoms) are formed
      • Electrons are lost from the outer shell (metals)
      • Electrons are gained in the outer shell (non-metals)
      • Form giant structures
      • Strong electrostatic forced of attraction
      • Represented using dot and cross diagrams
      • Sodium chloride forms  giant ionic lattice. There are strong electrostatic forces of attraction between the oppositely charged ions.
    • Formulae of ionic compounds
      • Worked out by ratios
      • Tells a chemist:
        • How many atoms are present
        • The elements present
        • The ratio of atoms present
      • Neutral
      • Formula can be worked out by balancing the charges
      • Brackets are used sometimes to show the ratio of ions in a compound
    • Covalent bonding
      • Between 2 non-metals
      • The sharing of electrons
      • Some atoms (e.g. carbon) can form several covalent bonds
      • Can form giant covalent structures
    • Metals
      • Delocalised electrons are formed
        • Free electrons
        • Allows the metal to conduct heat and electricity
      • Atoms are all the same size
      • Form giant structures
      • Layers of atoms are joined in regular aatterns
      • The strong electrostatic forces between the delocalised electronsand positive ions hold the structure together


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