Answer: protons
Step-by-step explanation:
An atom is the smallest entity of a substance which consists of three subatomic particles called as neutrons, protons and electrons.
The most of the mass of the atom is concentrated in the centre of an atom and is called as nucleus. Protons and neutrons are collectively called as nucleons as they are present in the nucleus.
Electrons revolve around the nucleus in fixed energy paths called as orbitals.
Protons carry positive charge, electrons carry negative charge and neutrons does not carry any charge.