1) Metallic bonding Noble gas has full atom shell, the atom is stable. Metals - One the left hand side of the periodic table. They all conduct electricity (1-3 electrons) Non-Metals - On the right hand side of the periodic table. (more than 3 electrons) Metalloids- Elements present in between metals and non-metals Ionic bonding: An ionic bond is formed when a metal atom bonds with a non-metal atom. Metal atom loses those 1 or 2 or 3 electrons from the outermost shell. Remember, atoms are neutral. When electrons (negative charges) are lost, positive charges dominates and the atoms becomes positive ion. Non-Metal atoms gain electrons to make the the outermost shell full. When a non-metal atom gains electron (s), the become negative ion. Once the ions are formed, they attract each other (+ and - attraction). This attraction of positive an negative ions is called ionic bonding.