Final answer:
Protons and neutrons, located in the nucleus, have masses close to 1 amu, while electrons orbiting the nucleus have about 1/2000th the mass of a proton or neutron.
Step-by-step explanation:
The three somatic particles that contribute to the mass of an atom are protons, neutrons, and electrons.
Protons and neutrons are collectively referred to as nucleons, and the number of these particles determines the mass of the atom.
The three somatic particles that change masses and their locations in an atom are:
Proton: The proton carries a positive charge and is located in the nucleus of the atom. It has a mass of approximately 1 atomic mass unit.
Neutron: The neutron is a neutral particle and also resides in the nucleus. It has a mass similar to that of a proton, approximately 1 atomic mass unit.
Electron: The electron carries a negative charge and orbits the nucleus at a high speed. It has a much smaller mass compared to protons and neutrons, about 1/2000th of their mass.