Saved Bookmarks
| 1. |
Bond Formation. |
|
Answer» Bonds formed between electropositive atoms are metallic, whereas those formed between electronegative atoms are covalent. If there is a difference in electronegativity values of two bonded atoms a polar covalent bond is formed where percent ionic character increases with the increase in the difference in electronegativity. When ∆EN > 1.7, the bond is said to have an ionic character greater than or equal to 50% and is referred to as an ionic bond (a bond between an electropositive and an electronegative atom). • Polarisation of the anion by the cation in an ionic compound leads to the development of a covalent character in ionic bonds. Fajan's rules for estimating covalent character states that small cations, large anions, large charge on either ion and cations with non-noble gas configuration give rise to the covalent character of ionic bonds. |
|