Question

which statement correctly defines an elements reactivity?
a property describing how readily atoms engage in a chemical reaction when they interact
the property of an element describing how it gains or loses a specific number of electrons
the tendency of an element to spontaneously emit a subatomic particle
the tendency of an element to become a positive or negative ion

Explanation:

Reactivity is about how easily atoms react chemically. Gaining/losing electrons is related but more about electronegativity and ionization energy. Spontaneous emission is radio - activity. Becoming an ion is part of reactivity but not the full definition.

Answer:

a property describing how readily atoms engage in a chemical reaction when they interact