The weight of a particle or an atom refers to its mass, usually measured in atomic mass units (amu) or kilograms (kg). Here are the approximate masses of common particles and atoms:
Electron: The mass of an electron is extremely small compared to protons and neutrons. Its mass is approximately 9.1 x 10^-31 kilograms (kg) or 0.0005486 atomic mass units (amu).
Proton: The mass of a proton is approximately 1.67 x 10^-27 kg or 1.007 atomic mass units (amu). It is roughly 1,836 times more massive than an electron.
Neutron: The mass of a neutron is very similar to that of a proton. It is approximately 1.67 x 10^-27 kg or 1.0087 atomic mass units (amu).
Hydrogen Atom: A hydrogen atom consists of a single proton and an electron. The total mass of a hydrogen atom is essentially the sum of the masses of its constituents. Thus, the mass of a hydrogen atom is approximately 1.67 x 10^-27 kg or 1.0078 atomic mass units (amu).
It's important to note that these values are approximate and represent average masses. Atomic masses can vary slightly due to the presence of isotopes, which are atoms with different numbers of neutrons while maintaining the same number of protons.
The atomic weight of an atom, as listed on the periodic table, is the average mass of the isotopes found in nature, taking into account their relative abundances. The atomic weight is expressed in atomic mass units (amu) or grams per mole (g/mol).