Question

Reactivity is defined as the capacity of a unit of matter, such as an atom, to undergo a chemical reaction with another unit of matter. What determines an atom's reactivity? O A. The number of protons in its outer shell. O B. The number of electrons in its outer shell. C. The number of protons and neutrons in its nucleus. D. The number of electrons and protons in its nucleus.​

Answer 1

B is the answer!!! hope this helps