Rohan Kubba Dis 4B wrote:I understand that there are not truly any definite values that dictate whether a bond is covalent or ionic. However, in the book it says that a good rule of thumb is that an electronegativity difference of two means that the bond has so much ionic character, it is best regarded as ionic. Are there any more values that implicate either covalent or ionic like this?
Ionic bonds also happen between metals and nonmetals, while covalent bonds happen between nonmetals.
In addition, ionic bonds happen due to a large difference in electronegativity (a value greater than two as you've mentioned), so much so that the electrons are actually ripped away from the metal by the nonmetal. Additionally, if the electronegative value is less than 0.5, it is nonpolar covalent which is when electrons are shared equally because the electronegativity of both atoms are relatively equal and if it is between 0.5 and 1.6, is it a polar covalent, meaning the electrons are unequally shared as one atom is more electronegative than the other, having increased electron density around the more electronegative atom.