Question

what do an electron and a neutron have in common? each particle has a mass of 1 amu. each particle exists inside an atom. each particle has an electrical charge. each particle is located in the nucleus.

Explanation:

Electrons and neutrons are both sub - atomic particles, meaning they exist inside an atom. An electron has a very small mass (not 1 amu), while a neutron has a mass of about 1 amu. Electrons have a negative electrical charge, and neutrons are electrically neutral. Electrons are outside the nucleus in electron shells, while neutrons are in the nucleus.

Answer:

Each particle exists inside an atom.