What is special about the atomic structure of group 1 in the periodic table?
They are the most electronegative like fluorine, strongest at attracting bonding pairs of electrons. As you go down the group the metal atoms get bigger therefore the nuclei get further away from the – delocalised electrons therefore the central positive protons carrying the + energy is further away therefore having less pull. As you go down the fall in boiling point is reflected by this as they become easier to break the bonds when melting and boiling these metals to produce a liquid or gas.
