All known particles, including subatomic particles, have some mass, even if it's extremely small.
While some particles, like neutrinos, have a mass so tiny it's almost negligible, it's still not zero.
The concept of a particle with no mass contradicts the fundamental principles of physics, particularly the mass-energy equivalence (E=mc²) proposed by Einstein.
It's important to note that photons, particles of light, are massless, but they are not considered atomic particles. They are fundamental particles, but they don't belong to atoms.
