Question

adds mass to the nucleus of the atom, but has no charge.
o neutrons
o electrons
o moles
o protons

Explanation:

Neutrons are sub - atomic particles located in the nucleus of an atom. They contribute to the mass of the nucleus but have no electrical charge. Electrons are outside the nucleus and have a negative charge. Moles are a unit of measurement in chemistry, not sub - atomic particles. Protons are in the nucleus but have a positive charge.

Answer:

A. neutrons