Electron
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
An atom
the atom
A Higgs-Boson particle.
This particle is called atom.
An atom is the smallest particle of a substance.