Question

What does an electron and neutron have in common

Answer 1

Very little except that they are both particles that make up atoms. The electron is a lepton with very little mass and a negative electrical charge. The neutron is a much more massive , chargeless particle (a hadron) which with protons ( positively-charged hadrons ) forms the atomic nucleus.

Answer 2

They have the same mass and are both located in the nucleus of the atom.