The electron cloud consists of electrons . It resides in the nucleus. The neutron also resides in the nucleus and has the same approximate mass as a proton. It has no charge, and does not contribute to the chemical properties of the atom. The electron has a negative charge and a mass that is far less than the protons or neutrons.
Electrons form the atomic cloud.
The number of electrons equals the number of protons to make the atom charge neutral. The Number of protons determines the atom. Each element has a abbreviation. Each type of atom is called an element. The atoms are arranged on a periodic table which conveniently assigns them certain properties.