Covalent and Ionic Bonds

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Tracy Tolentino_2E
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Joined: Sat Sep 07, 2019 12:17 am

Covalent and Ionic Bonds

Postby Tracy Tolentino_2E » Sun Nov 03, 2019 11:46 pm

Can someone explain the concept of a molecule having both ionic and covalent characters. How do we determine which is more?

Brian_Ho_2B
Posts: 221
Joined: Fri Aug 09, 2019 12:16 am

Re: Covalent and Ionic Bonds

Postby Brian_Ho_2B » Mon Nov 04, 2019 12:13 pm

Whenever a molecule or compound has at least two atoms of different elements, that molecule is said to have BOTH ionic and covalent character. The best way to determine if the bond between two atoms is more ionic or covalent is to compare their electronegativity values (which would be given on a test). If the difference in electronegativity is more than 2, than it has much more ionic character than covalent character. If the difference is 0.5-1.5, than the bond is more covalent than ionic (polar covalent, in fact). If the difference is less than 0.5, than it is likely that the bond is nonpolar covalent.

aishwarya_atmakuri
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Re: Covalent and Ionic Bonds

Postby aishwarya_atmakuri » Mon Nov 04, 2019 12:33 pm

You can use the electronegativity difference between the two atoms to determine whether it has more ionic or covalent character. If the difference is greater than 1.5, it is ionic. If it is between 0.5 and 1.5, it is polar covalent. If it is less than 0.5, it is nonpolar covalent.

RoshniVarmaDis1K
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Re: Covalent and Ionic Bonds

Postby RoshniVarmaDis1K » Mon Nov 04, 2019 1:27 pm

When two different atoms are bonded together, the bond has covalent and ionic characteristics.

Ionic bonds (electronegativity difference > 2) have covalent characteristics because the electrostatic attractions of the negative ion towards the positive ion pulls electrons into the bonding region. The more strongly electrons are pulled into the bonding region, the more covalent characteristic exists.

Covalent bonds (electronegativity difference < 1.5) has ionic characteristics because the electronegativity difference pulls electrons in a certain direction.

EvaLi_3J
Posts: 53
Joined: Wed Oct 02, 2019 12:16 am

Re: Covalent and Ionic Bonds

Postby EvaLi_3J » Thu Nov 07, 2019 1:00 pm

I guess the most formal ways to explain them is looking at the differences between the electronegativity values for atoms that bond together. If two atoms have their electronegativity values differ by more than 2, they are more ionic. If less than 1.6, they are more covalent.

Sanjana Munagala_1j
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Re: Covalent and Ionic Bonds

Postby Sanjana Munagala_1j » Fri Nov 08, 2019 10:56 am

Normally we are not given electronegative values. Because of this, I recommend using periodic trends. Cations with lower electronegativity, which are located in the bottom left of the periodic table paired with anions with higher electronegativity, which are located in the upper right of the periodic table tend to have a greater difference in electronegativity, and thus are more ionic in character.

Hope this helps!

Liliana Aguas 3G
Posts: 59
Joined: Wed Sep 18, 2019 12:20 am

Re: Covalent and Ionic Bonds

Postby Liliana Aguas 3G » Sun Nov 10, 2019 11:33 pm

Yes it is easier to use the period trends and understand the concept behind it so you can be given any problem and have the best way to approach.


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