It is found that a pair of electrons, shared between two positively charged nuclei, will be attracted by both nuclei to form a chemical bond .
All chemical bonds form because electrons are placed simultaneously near two positive nuclei.
It is possible for a pair of atoms to form double or triple bonds to satisfy the octet rule. When the bonding electrons are somewhat closer to one of the atoms, the bond is said to have ionic character. The term ionic bond indicates the electrons are displaced so much toward one atom that the bonded atoms must be considered a pair of ions that are near each other. Atoms forming metals are characterised by vacant valence orbitals and low electron ionisation energy. When non-ionic metal atoms combined, they are held together in networks via metallic bonds .