As chemistry

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Author:
ghoran
ID:
246338
Filename:
As chemistry
Updated:
2013-11-11 15:27:58
Tags:
Ionic metallic bonding
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  1. Ions form when
    Atoms loose or gain electrons
  2. Positive ions form when
    Atoms loose electrons
  3. Negative ions form when
    Atoms gain electrons
  4. An ionic bond is the
    Electrostatic force of attraction between Oppositely charged ions . This force is strong and requires a lot energy to be overcome so ionic bonds are broken . This means that ionic compounds have high. Melting and biking points
  5. Ionic compounds must contain
    A metal and non metal except ammonium Salts
  6. which has the highest melting point lithium chloride or potassium chloride
    A Lithium ion is a smaller ion than a potassium ion and has a higher charge density . This means there is a greater force of electrostatic attraction between positive and negative ions meaning more energy is required to break the force NB both have same charge so charge cant influence anything
  7. Bonding is
    Attraction between particles
  8. Structure is
    Arrangement of particles
  9. Ionic substances have a .... Structure
    Lattice
  10. Metallic bonding is the
    Strong electrostatic force of attraction between positively charged metal ions and a sea of delocalised electrons . The delocalised electrons come from the highest energy level
  11. Why do metals conduct electricity
    They have a sea of delocalised electrons which are free to move in a given direction if a force is applied
  12. Why are metals malleable
    The sea of delocalised electrons allow layers of atoms to slide over each other allowing metals to be bent and shaped 

    the electrostatic forces of attraction between the positive metal ions and the delocalised electrons aren't disrupted if a force is applied
  13. to melt a metal we would be breaking the
    Electrostatic force of attraction between positive metal ion and delocalised electron
  14. does lithium or sodium have the highest melting point
    Lithium is a smaller ion than sodium therefor there are stronger forces of electrostatic attraction between the metal ions and delocalised electrons than there are in sodium so lithium has the greatest melting point
  15. Does sodium or aluminium have the highest melting point
    Aluminium has a higher charge and more delocalised electrons. Therefor there are stronger forces of electrostatic attraction between the metal ions and delocalised electrons in aluminium than there are in sodium , so aluminium has a higher melting point

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