Question

the atomic model timeline is missing some labels. what would be the subatomic particle(s) found inside the section labeled \a\? electron neutron proton

Explanation:

In an atom, neutrons and protons are located in the nucleus. Electrons are outside the nucleus in electron - shells. Since the question asks about a sub - atomic particle inside a section (presumably the nucleus), neutrons are a correct answer as they are found in the nucleus along with protons.

Answer:

neutron