The bonding pairs of electrons in covalent bonds are pulled between the nuclei of the atoms sharing the electrons.
Equal sharing of electrons=non-polar bond.
Unequal sharing of electrons=polar bond.
The more electronegative atom attracts more strongly and gains a slightly negative charge.
The less electronegative atom has a slightly positive charge.
- Farthest away from fluorine (F).

Polar Covalent Bonds:

HCl has a polar bond.
The chlorine atom acquires a slightly negative charge.
The hydrogen atom acquires a slightly positive charge.
The O--H bonds in a water molecule are also polar.
- Oxygen is more negative because it is closer to Fluorine (F).

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Notes from powerpoint