I'm not exactly sure but it's probably: electrons, neutrons, and protons.
The electron is the smallest particle of the atom, in the traditional sense. However, the neutrino is far smaller than the electron, and is thus the smallest particle. You could also argue that the photon, with zero rest mass, is actually the smallest, but that's a quantum mechanics question that seems to be beyond the scope of this question.
An atom is the smallest particle of a substance.
An iron atom is the smallest iron particle that still has the properties of iron.
This particle is the atom.
The smallest particle of an element in chemistry is an atom. Atoms are made up of protons, neutrons, and electrons.
A quark is the smallest particle in matter.
The smallest particle of an element is called an atom.
The smallest particle in the atom is the electron.
An atom is the smallest particle of a substance.
An atom is a particle, the smallest particle that can exist by itself.
An iron atom is the smallest iron particle that still has the properties of iron.
No, for all elements the smallest particle that can exist independently is an atom.
atom is the smallest particle of matter
Electron
An atom
the atom
A Higgs-Boson particle.
This particle is called atom.