Polar Covalent Bonds. Trends in the Periodic Table and Bonding. -. -. -. -. +. +. +. +. Covalent Bonding. A covalent bond is a shared pair of electrons electrostatically attracted to the positive nuclei of two atoms. Both nuclei try to pull the electrons towards themselves .
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Trends in the Periodic Table and Bonding
A covalent bond is a shared pair of electrons electrostatically attracted to the positive nuclei of two atoms.
Both nuclei try to pull the electrons towards themselves
The atoms achieve a stable outer electron arrangement (a noble gas arrangement) by sharing electrons.
This is like a tug-of-war where both sides are pulling on the same object.
It creates a strong bond between the two atoms.
Picture a tug-of-war:
If both teams pull with the same force the mid-point of the rope will not move.
What if it was an uneven tug-of-war?
The team on the right are far stronger, so will pull the rope harder and the mid-point of the rope will move to the right.
A polar covalent bond is a bond formed when the shared pair of electrons in a covalent bond are not shared equally.
This is due to different elements having different electronegativities.
IPolar Covalent Bond
e.g. Hydrogen Iodide
If hydrogen iodide contained a pure covalent bond, the electrons would be shared equally as shown above.
This makes iodine slightly negative and hydrogen slightly positive. This is known as a dipole.
However, iodine has a higher electronegativity and pulls the bonding electrons towards itself
(winning the tug-of-war)