Protons and Neutrons.
The mass of an atom is primarily contained in its nucleus, which is made up of protons and neutrons. Electrons, which have a much smaller mass compared to protons and neutrons, occupy the space surrounding the nucleus.
Protons and neutrons are contained within the nucleus of an atom. The nucleus is located at the center of the atom and it is where most of the atom's mass is concentrated. Electrons, which are negatively charged particles, orbit around the nucleus in electron shells.
Protons and neutrons. Virtually all of the atom's mass.
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Neutrons
Neutrons
No, the nucleus is part of the atom.
Over 99% of the mass of an atom is contained in the nucleus, where protons and neutrons are located. Electrons, which have negligible mass compared to protons and neutrons, occupy the remaining space in the electron cloud surrounding the nucleus.
A carbon-14 atom contains 6 protons in its nucleus.
The protons which are contained in the nucleus.
When calculating the mass of an atom, you add the mass of the protons and the neutrons. This is the nucleus of the atom. The electrons are small enough to be ignored except in the most delicate calculations.
The electron is not located in the nucleus of an atom. Rather, they orbit around the outside of it.