Your email address will not be published. There are 6 atoms in the first ring called pyrimidine ring and 5 atoms in the second ring called imidazole ring. Structure Of An Atom The Charge Of An Atom Ppt Download In different energy levels that have specific numbers of orbitals. . An atom is the smallest unit of ordinary matter that forms a chemical elementEvery solid liquid gas and plasma is composed of neutral or ionized atoms. 2eight in the first energy level zero in the second energy level. What are the rings around the nucleus that hold electrons called. Remember electrons are orbiting the nucleus in the region called the electron cloud. Neons Ring 2 is now filled with eight electrons. The rings of electrons around the neutrons and protons in the nucleus of an atom are called orbitals. It is called the 1s orbital because it is spherical around the nucleus. Hydrogen and Helium are in the first energy lev...