Answer: Neutrons
Explanation:
There are three subatomic particles:
1. Electrons: that carry's a negative charge(-) and a mass of ~1/1836. They are found in the outer shell/orbit of an atom
2.Protons: that carry's a positive charge(+) and a mass of 1.6726219 × 10^-27. They are found in the nucleus of an atom.
3. neutrons: they are neutral and has no charge and a mass of 1.674929 x 10-27 kg.They are also found in the nucleus of an atom.