The metals (electropositive elements) and the non-metals (electronegative elements) are able to form ionic bond. Like NaCl is formed by ionic bond, Na is a metal (can easily lose electron) and Cl is a non-metals (can easily gain electron) to get stability form an ionic bond. read more
Covalent bonds form between atoms of nonmetallic elements. In general, bonds are considered to be covalent if the electronegativity difference between the two atoms bonding is less than 2.0 Pauling units. read more
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion. read more