The p block represents the non-metals while the s and d blocks represent the metals. Non-metals (p block) usually have 4 or more valance electrons that they want to give away, and for this reason they tend to form negative ions. Non-metals are dull, are poor conductors of heat and electricity, have low density, and have low melting and boiling points. On the other hand, the metals (s and d block) usually have 3 or fewer valance electrons and tend to form positive ions. They are shiny, are good conductors of heat and electricity, have a high density, and have high melting and boiling points.