Trend across periods 2 and 3
Groups 1 - 4. General increase in boiling points.
Groups 4 - 5. Sharp decrease in boiling point.
Groups 5 - 0. Comparatively low boiling points.
Between group 4 and 5, elements go from giant metallic structures to simple molecular structures. The forces also change from metallic bonding to van der Waals forces, which are much easier to break.
Mpts & bpts of metals in period 3 increase across period because there is an increase in ionic charge and number of delocalised outershell electrons. This increases the electrostatic attraction increaing melting and boiling points.
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