Chemical Activity:

• Metals increase in chemical activity as you go from right to left on a horizontal row and from top to bottom in a vertical column.
  The most active metal is Francium.

  

• Nonmetals increase in chemical activity as you go from left to right on a horizontal row and from bottom to top in a vertical column.
  The most active nonmetal is Fluorine.

  

• Group 18 (Noble Gases) on the Periodic Table are chemically inert nonmetals.