Though today we know that an atom is made up of 3 types of sub-atomic particles (electrons,protons and neutrons) but it is found that each electron has a mass very less in comparison to the mass of other particles.So, its mass is taken to be negligible and is not counted to be contributing to mass of entire atom.On other hand, protons and neutrons have noticeable masses and are almost equal to each other in masses.These both are found in nucleus of atom and are considered to be contributing to the mass of the atom.
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Protons and neutrons contribute to the Atomic Mass of an atom. Electrons, despite having mass, contribute negligibly to the overall atomic mass due to their much smaller mass compared to protons and neutrons.
Isotopes are caused by variations in the number of neutrons in an atom's nucleus. Neutrons are subatomic particles that do not carry an electric charge and contribute to an atom's mass. The different number of neutrons in isotopes result in variations in atomic mass.
Atomic Number is the amount of Protons (positively charged subatomic particles) contained in the nucleus of an atom.
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.
Subatomic particles are particles that are smaller than the atom. Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. Neutrons have no electrical charge. Electrons have a negative (-) chargeProton, neutron, and electron.
Electrons are the subatomic particles found in the orbitals of an atom. They are negatively charged and contribute to the atom's interactions with other atoms.