Electrons, due to their movement around the nucleus.
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The subatomic particles that contribute to the mass of an atom's volume are protons, neutrons, and electrons. Protons and neutrons are located in the nucleus of an atom and have a much greater mass than electrons, which orbit the nucleus. The combined mass of protons and neutrons provides most of the mass in an atom.
I'm going to assume you meant mass and not volume. The entire atom contributes the volume of an atom. That's what volume is.
The atom consists of three subatomic particles: electrons, protons and neutrons. Electrons have almost no mass and only contribute to the charge of the atom.
Neutrons and protons are the two particles that contribute to the mass. Both are found in the nucleus. Neutrons have no charge and are just there to make the atom heavy and keep the protons from falling apart. That's why it is sometimes referred to as "atomic glue". Protons also contribute to the mass.
Hope that helps.
Neutrons and Protons eache weigh approximately one Dalton. Electrons do have weight but it is so small a fraction of a Dalton that it is generally not included in any weight calculations.
The subatomic particles that contribute to the mass of an atom are protons, neutrons, and electrons. Protons and neutrons are located in the nucleus and account for most of the mass, while electrons have negligible mass but contribute to the overall charge and stability of the atom.
Light has mass but no volume. Although light particles called photons have energy and momentum which contribute to their mass, they are considered massless particles because they have zero rest mass and do not occupy physical space.
The electron is the subatomic particle with the least mass. It has a mass of about 1/1836 of a proton or neutron.
protons is the same number as the atomic number always and protons plus the average number of neutrons makes up the atomic mass
A neutron is the subatomic particle with a charge of 0 and a mass of 1 atomic mass unit.