The nucleus is made up of positively charged protons and neutral neutrons, while the electron cloud consists of negatively-charged electrons which orbit the nucleus to balance out the positive charge of the protons.
The nucleus is made up of positively charged protons and neutrons that have no charge, while the electron cloud consists of negatively-charged electrons which orbit the nucleus. In a neutral atom, the negatively-charged electrons balance out the positive charge of the protons.