Carbon

Electrons

It is negatively charged particle, which revolve around the nucleus of the atom is specific orbits.

Atomic number is the number of protons, an atom contains

The number of electrons or protons is an atom is called the atomic number (Z) of an atom.

An atom is the smallest particle of a chemical element that retains its chemical properties.

Atoms of the same element can have different number of neutrons. Such atoms will have same atomic number but different mass numbers. These atoms are called isotopes. For example Hydrogen has three isotopes Hydrogen (₁H¹), Deuterium (₁H²), Tritium (₁H³).

i) Protons and neutrons in the nucleus of an atom are called as nucleons.
ii) They are located in the nucleus of an atom and are called so.
Properties:
i) Atomic mass is only depends on the mass of nucleous.
ii) They make the atom electrically neutral. (Protons - Positive, Neutrons - Neutral)
iii) Nucleons are similar in properties like mass except charge.

Sub-atomic particles:
(i) Proton (p): This is the positively charged particle and it is located at the nucleus.
(ii) Neutron (n): Neutron is inside the nucleus. The neutron does not have any charge. Except hydrogen (protium), the nucleus of all atoms contain neutrons.
(iii) Electron(e): This is a negatively charged particle. Electrons revolve around the nucleus of the atom in specific orbits.