it is called the proton
This particle is the proton.
The number of protons defines the element.
An atom is a particle, the smallest particle that can exist by itself.
The smallest particle of an element is called an atom.
The atom is the smallest known particle.
In the atom the particle without electrical charge is the neutron.
The smallest particle in the atom is the electron.
This particle from the atom is the electron.
The number of protons in an atom's nucleus determines its chemical identity.
An iron atom is the smallest iron particle that still has the properties of iron.
the positivly charged particle in the nuclus of an atom is a proton
This particle is the atom.