The most reactive metals will be found in Group 1 on the right side of the Periodic Table.
Group 1, or the alkali metals, left of the table and Group 17, the halogens, right of the table are the most reactive groups. Fr, or Francium (atomic number 87) is the most reactive metal- and fluorine the most reactive halogen. Francium and fluorine would react together explosively they are so reactive.
The metalloids split the table these are a diagonal group of elements, B, Si, Ge, As, Sb and Te. To their right are the non metals to the left the metals. There are many more metals than any other type of element. See Wikipedia article "Periodic table (metals and non metals)"
The more reactive elements on the periodic table are farther down in the rows. For example, Te, or Tellurium, is in group 16 and row 5. The elements in row 7 are the most reactive, but technically Tellurium, since it is the farthest down nonmetal on the periodic table, would be the most reactive nonmetal, technically making group 16 the most reactive row of the nonmetals.
metals
Nonmetals are to the right of the metalloids on the periodic table.
the alkali metals are the most reactive... either cesium or francium would be the most reactive out of this group.
Metals are more reactive elements.
Inert gasses are completely non reactive. The next least reactive would be some where in the middle of the periodic table (probably precious metals).
Group 1, or the alkali metals, left of the table and Group 17, the halogens, right of the table are the most reactive groups. Fr, or Francium (atomic number 87) is the most reactive metal- and fluorine the most reactive halogen. Francium and fluorine would react together explosively they are so reactive.
The metals in group 13 would be less reactive than the metals in group 1 because the metals in group 1 are closest to the left of the Periodic Table. And any thing to the left are more reactive.
The metalloids split the table these are a diagonal group of elements, B, Si, Ge, As, Sb and Te. To their right are the non metals to the left the metals. There are many more metals than any other type of element. See Wikipedia article "Periodic table (metals and non metals)"
The more reactive elements on the periodic table are farther down in the rows. For example, Te, or Tellurium, is in group 16 and row 5. The elements in row 7 are the most reactive, but technically Tellurium, since it is the farthest down nonmetal on the periodic table, would be the most reactive nonmetal, technically making group 16 the most reactive row of the nonmetals.
metals
Less reactive non metals are in the 18th group. They are noble gasses. From all the noble gasses, Xe is the only gas which forms compounds.
On some periodic tables metals have a different color.
The NON-metals are in the upper right corner of the Periodic Table, roughly outside the Carbon-Iodine diagonal line.
The mass of an element increases as you go down the periodic table. The heaviest discovered (synthesized) metals are in the bottom row of the transition metals group.