Answer:
[tex]\Large \boxed{\mathrm{neutrons}}[/tex]
Explanation:
Protons have about the same mass as neutrons.
Protons have a mass of 1 amu
Neutrons have a mass of 1 amu
Electrons have a mass of 1/1836 amu
Protons and neutrons have approximately the same mass,
1.6726219 × 10^-27 kilograms is the mass of protons as well as neutrons
