* Electronegativity- the attraction of an atom for for a shared pair of electrons.
Firstly is the covalent bond. A covalent bond is when two atoms are sharing a pair of electrons relatively evenly. When the electronegativity between two atoms are 0.5 or less, it is a covalent bond.
Example: F and F
Since the electronegativity difference is 0, it is a covalent bond.
Next is the polar covalent bond. A polar covalent bond occurs when there is an unequal attraction for shared electorns. One atom will end up with a slightly negative charge and the other will end up with a slightly positive charge. For polar covalent bonds, the attraction is stronger so it is harder to seperate the atoms.
Example: B and Cl
Since the electronegativity difference is over 0.5 and under 1.8, it is a polar covalent bond.
Lastly is the ionic bond. Unlike the covalent and the polar covalent bond, the ionic bond does not share the electrons. An ionic bond is made by the attraction of two oppositely charged ions.When the electronegativity difference is 1.8 or more, it is considered a ionic bond.
Example: K and Br
Since the electronegativity difference is over 1.8, it is an ionic bond.