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A covalent bond. Non-polar covalent is stronger than polar covalent as well.
Hydrogen and Fluorine form the most polar bond H-F, the difference of electronegativities is 1.9.
Check the electronegativities of the atoms in the bond. The bond will be polar if there is a difference in electronegativity. The most electronegative element will attract the bonding eletrons to it becoming slightly negatively charged. The other end of the bond will become slightly positively charged. For example a bond between carbon and chlorine, C-Cl: C electronegativity 2.55 Cl electronegativity 3.16 The bond will be polar because of the difference in electronegativity, and Cl will be slightly negative, carbon slightly positive.
Oxygen is an element, not a bond. It will form polar bonds with most other elements, though because it is very electronegative. However, when it bonds with itself as in O2 the bonds are nonpolar.
H2 molecule is the least polar. Between H2O and H2S, the most polar will be H2O as oxygen is more electronegative than sulphur.
A covalent bond is most likely to be polar when there is a large difference in the electronegativity of the two atoms that form the bond.
a non-polar covalent bond
A good candidate would be the bond in HF.
A covalent bond. Non-polar covalent is stronger than polar covalent as well.
Hydrogen and Fluorine form the most polar bond H-F, the difference of electronegativities is 1.9.
A polar covalent bond is a bond between two nonmetal atoms with different electronegativity's. Technically, only a bond between identical nonmetal atoms would be truly nonpolar, but in most cases a threshold is set for electronegativity difference to be considered polar.
A covalent (polar or non-polar) bond is formed
Nitrogen will form a non polar bond to another nitrogen, a polar bond to other atoms with different electronegativity. In NH3 N is the most electronegative, in NF3 it is F that is the most electronegative.
The bond between Boron (b) and AT can be considered as the least polar bond. This is because they both carry an electromagnetic value of 2 and 2.2 respectively thus a small difference of 0.2 EN in between.
Check the electronegativities of the atoms in the bond. The bond will be polar if there is a difference in electronegativity. The most electronegative element will attract the bonding eletrons to it becoming slightly negatively charged. The other end of the bond will become slightly positively charged. For example a bond between carbon and chlorine, C-Cl: C electronegativity 2.55 Cl electronegativity 3.16 The bond will be polar because of the difference in electronegativity, and Cl will be slightly negative, carbon slightly positive.
Oxygen is an element, not a bond. It will form polar bonds with most other elements, though because it is very electronegative. However, when it bonds with itself as in O2 the bonds are nonpolar.
Molecules can be polar or non-polar; bonds are what hold molecules together, but they are not in themselves polar or non-polar. I should point out that the most famous polar molecule in the world, the water molecule, does have covalent bonds.