Question

a neutron can be defined as
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a particle with mass roughly equal to that of the proton on the inside of the atom.
a particle with no mass but located on the inside of the atom.
a particle with no mass and no charge.
a particle with no charge located on the outside of the atom.

Explanation:

Neutrons are sub - atomic particles found in the nucleus of an atom. They have no electric charge and a mass approximately equal to that of a proton.

Answer:

A particle with no charge located inside of the atom and with mass roughly equal to that of the proton.