How does reactivity relate to the Periodic Table

For metals:

- Reactivity increases as you go down a group, the further you go down, the easier the metals take or give electron

- Reactivity decreases as you go across, more energy required to get rid of valence electron

For non-metals:

- Reactivity increases as you go up a group. Electronegativity increases as you go higher up, more powerful exchange of electrons

- Relativity increases as you go across since the closer you get to fill up your s - and p - orbitals the more motivated you are to do so.