How does electronegativity relate to the reactivity of metals?
it depends to a great extent
metals are less electronegative that is more electro positive . they have more tendency to donate electrons to elements having more electro-negativity . so more the electro-positive the metal more the tendency to react .
you can also think that a metal to be a man having money . if the metal has more electro-positivity that is more money he is likely to spend more money