Ionic vs. Covalent Bonds  [ENDORSED]

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Abbey Kerscher 3O
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Ionic vs. Covalent Bonds

Postby Abbey Kerscher 3O » Wed Oct 19, 2016 2:31 pm

I don't really understand why/how electronegativity determines a molecule having an ionic bond or a covalent bond. Can someone please help?

Joyce Wu 3E
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Re: Ionic vs. Covalent Bonds  [ENDORSED]

Postby Joyce Wu 3E » Wed Oct 19, 2016 3:17 pm

Electronegativity can be defined as "the power of an atom in a molecule to attract electrons to itself". In a non-polar covalent bond, there is an equal sharing of electrons in the bond; thus, the electronegativity difference is very small. In a polar covalent bond, there is an unequal sharing of electrons therefore the electronegativity difference is a bit higher. In an ionic bond, there is a complete transfer in electrons and the electronegativity difference is the highest.
In summary:
1. If the electronegativity difference (ΔEN) is less than 0.5, then the bond is nonpolar covalent.
2. If the ΔEN is between 0.5 and 1.6, the bond is considered polar covalent
3. If the ΔEN is greater than 2.0, then the bond is ionic.

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Re: Ionic vs. Covalent Bonds

Postby Cobie_Allen_1H » Fri Oct 21, 2016 6:31 pm

I had the same question! Thanks! This is very helpful!

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