How to tell from whether it is covalent or ionic

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604408097
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Joined: Fri Sep 25, 2015 3:00 am

How to tell from whether it is covalent or ionic

Postby 604408097 » Fri Oct 23, 2015 2:19 pm

I need help on determining what is the difference between covalent or ionic bonds. I know what covalent is but how do you determine if a bond is ionic?

Matthew Oh 3I
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: How to tell from whether it is covalent or ionic

Postby Matthew Oh 3I » Fri Oct 23, 2015 3:12 pm

Covalent bond is when two atoms share electrons. Ionic bond is when an electron is given up or accepted; the ions are attracted to one another because they have opposite charges.

KarenaKaing_1D
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

Re: How to tell from whether it is covalent or ionic

Postby KarenaKaing_1D » Fri Oct 23, 2015 4:34 pm

You can also find the electronegativity difference of two atoms. If the difference is >2, it is an ionic bond. If the difference is <1.5, it is a covalent bond.

Melissa Kulon 2D
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Re: How to tell from whether it is covalent or ionic

Postby Melissa Kulon 2D » Wed Oct 28, 2015 4:19 pm

Usually, if the electronegativity difference is above 2, then it is considered ionic, but if the difference less than 1.5, then it's usually covalent. However, you would need to be given the electronegativity values to do this. So, if you're given the molecular formulas (such as HCl or HI), one of the best ways to tell if it's more covalent or ionic is to look and see which of the non-metal elements is more electronegative. Since electronegativity increases when moving towards top right hand corner (F having the highest electronegativity), then Cl would have a closer electronegative value to H than I would. Thus, HF would have a more ionic bond and HCl would have a more covalent bond.


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