Covalent Bonds

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akaylaco_1k
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Covalent Bonds

Postby akaylaco_1k » Sat Oct 31, 2015 3:10 pm

Could someone please explain to me how to find covalent character?

Kevin Wright
Posts: 14
Joined: Fri Sep 25, 2015 3:00 am

Re: Covalent Bonds

Postby Kevin Wright » Sat Oct 31, 2015 3:26 pm

All bonding interactions have some covalent character. The degree of how ionic vs how covalent a bond is is determined by the difference in electronegativity of the two atoms. If the difference in electronegativity between two atoms is greater than 2, then it is considered to be mainly ionic in character. If the difference is less than 1.5, then it is considered to be mainly covalent in character.

ex) Na: 0.9 and Cl: 3.0. difference between the two is 2.1 so NaCl is mainly ionic
ex) C: 2.5 and 0: 3.5. Difference between the two is 1.0 so CO is mainly covalent

Vanessa A 3F
Posts: 29
Joined: Fri Sep 25, 2015 3:00 am

Re: Covalent Bonds

Postby Vanessa A 3F » Sat Oct 31, 2015 3:27 pm

"Covalent character" is usually thought of in relative terms, and refers to the relative covalent character of ionic bonds. This is because we already know all covalent bonds have covalent character, by definition.
So, an ionic bond has more covalent character if there is less of a difference in electronegativity values between the elements.
For example, sodium chloride has more covalent character than francium bromide. Note the distances between the elements on the periodic table. Francium is quite far from Fluorine, and Sodium is comparatively closer.
As an element approaches F, it will have greater covalent character.


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