10 Questions
    1.   What type of bonding do metals have?
    2.   Draw a diagram to show the arrangement of atoms in a metal.
    3.   Do metals have a regular or irregular structure?
    4.   What is the main purpose of alloying metals?
    5.   What are alloys called that can return to their original shape?
    6.   How can we return them to their original shape?
    7.   What happens to valence (outer) electrons in a metal?
    8.   What forces of attraction hold metal atoms together?
    9.   Why can metals conduct electricity?
    10. Draw a diagram to show the bonding present in solid sodium.
                                Metallic bonding
                                      Mark Scheme
     Metallic bonding                                                              Polymers and Nanoscience
     1.    Metallic                                                                1.    High Density (HD)
     2.                                                                            2.    Thermosoftening
                                                                                   3.    Thermosetting
                                                                                   4.    Cross-links in the structure
                                                                                   5.    The melting point of a thermosoftening polymer is 
                                                                                         determined by the strength of the INTERMOLECULAR 
     3.    Regular                                                                       FORCES
     4.    To make them harder                                                     6.    Gets bigger
     5.    Shape memory alloys                                                     7.    Nanoscience is the science of very small particles and looks 
     6.    Heat them up                                                                  at the properties of nanoparticles.
     7.    The outer electrons of metal atoms are delocalised and so               8.    A nanoparticle is about 100 atoms
           free to move through the whole structure.                               9.    Advantages:
     8.    Strong electrostatic attractions.                                            •    Large surface area makes them effective catalysts.
     9.    Metals conduct heat and electricity because of the                           •    Nanotubes can be used in small scale circuits as 
           delocalised electrons.                                                            nanowires.
     10.                                                                                 Disadvantages:
                                                                                        •    So small they can enter the skin and therefore the 
                                                                                             bloodstream.
                                                                                        •    Easily become airborne, breathing in can potentially 
                                                                                             damage the lungs.
                                                                                   10.   Sun screens (or) Bandages - others
                Positive ions in a sea of delocalised electrons