3. The chemical reactivity of an element is dependent on

A. the number of protons.

B. the arrangement of neutrons.

C. the number of electrons in the outermost shell.

D. the number of protons and neutrons.

E. the number of electrons in the inner shell.

 It is the outermost shell of an atom that can potentially react with electrons in the outermost

shells of other atoms. The protons and neutrons remain in the nucleus and do not engage in

chemical reactions.

Bloom's Level: ...