What trend does the reactivity of nonmetals show in a periodic table?

As you move from left to right in the period, we see that the reactivity increases. On the other hand, as you move down a group in the nonmetals, the reactivity decreases. The farther right and up you go on the periodic table, the higher theelectronegativity, resulting in a more vigorous exchange of electrons.

The teacher is mostly talking about the distillation of a mixture