Explain the difference between a pure covalent bond, a polar covalent bond, and an ionic bond.
Solution 20 E Step 1 of 1 The difference between these three kind of bonds stands in the difference of electronegativity values belonging to the atoms bonded EN= Electronegativity( most electronegative atom) – Electronegativity (less electronegative atom) a) If EN> 1.9 we have an ionic bond. Electrons are transferred from the less electronegative atom to the one having the higher electronegativity value. b) If 0.4< EN < 1.9 we have a polar covalent bond. In this case, the two atoms will share the electrons unequally, thus assuming a fractional negative charge (the atom having the higher electronegativity value) and the other a positive charge (the atom having the lower electronegativity value). c) If 0 < EN < 0.4 we have a non-polar covalent bond. In this case, the two atoms will share the electrons equally because there is a significant difference in the tendence to attract bonding electrons by none of the atoms involved in this kind of bond.