ANSWER ASAP thanks Which determines the reactivity of an alkali metal?

its boiling and melting points
the shininess of its surface
the number of protons it has
its ability to lose electrons

Option D: it's ability to lose electrons

Explanation:

Alkali metals are usually discovered in nature. They have highly reactivity at STP conditions (standard temperature and pressure conditions) and easily lose their outermost electron to form positive ions known that have a charge of +1.

Thus, what can determine the extent of reactivity of an alkali metal, is it's ability to lose electrons