3A - Periodicity

    1)           What are the similarities in the electron configuration for the atoms of Group 7?  [1]

    2)    a)    Define first ionisation energy [3]

           b)    Explain the trends in atomic radius across a period [4]

           c)    Use your answer in (b) to explain the trends in 1st ionisation energies across a period? [5]

    3)    a)    Explain the trends in atomic radius down a Group.  [3]

           b)    Use your answer in (a) to explain the trends in 1st ionisation energies down a Group?  [4]

    4)    a)    Why is the melting point of magnesium greater than that of sodium?  [3]

           b)    Why is the boiling point of carbon greater than that of oxygen? [4]