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 sub - atomic particles. Electrons have a very small mass (not 1 amu), are negatively charged and are outside the nucleus. Neutrons have a mass of about 1 amu, are neutral and are in the nucleus. The commonality is that both are components of an atom.

Answer:

B. Each particle exists inside an atom