Question

what subatomic particle has a mass of 1/2,000 amu? the alpha particle the neutron the electron the proton

Explanation:

Alpha - particles are made of 2 protons and 2 neutrons and have a large mass. Neutrons and protons have a mass of approximately 1 amu. Electrons have a very small mass, about 1/2,000 amu.

Answer:

C. The electron