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### How to tell which elements will be most likely to form a covalent bond

Posted: Thu May 17, 2018 6:52 am
If you're given a list of elements such as
K and Cl
H and O
Al and Mg
K and Na
how do you tell which elements will most likely form a covalent bond?

### Re: How to tell which elements will be most likely to form a covalent bond

Posted: Thu May 17, 2018 8:34 am
I think when you're trying to determine whether a bond is ionic or covalent, you look at the electronegativity difference between the 2 atoms. If the difference is greater than 2 its ionic and if its less than 1.5 its covalent. You would find the electronegativity values on a chart in the book. I hope this answers your question!

### Re: How to tell which elements will be most likely to form a covalent bond

Posted: Thu May 17, 2018 1:58 pm
The electronegativity difference would be used to determine if an ionic or covalent bond is formed. Just as stated above, a difference greater than 2 forms an ionic bond, and a difference less than 1.5 forms a covalent bond. A rough estimate could also be done by simply looking at the periodic table. The further away two atoms are from each other on the table, the more likely an ionic bond will form (since electronegativity increases across a period). For example, Na and Cl are on opposite ends of the periodic table, and will form an ionic bond, whereas CO2 (the C and O atoms are closer on the periodic table) will form a covalent bond.

### Re: How to tell which elements will be most likely to form a covalent bond

Posted: Thu May 17, 2018 5:59 pm
Alicia Yu 1A wrote:If you're given a list of elements such as
K and Cl
H and O
Al and Mg
K and Na
how do you tell which elements will most likely form a covalent bond?

These are the bonds I got after doing the calculations, Please correct me if I am wrong!
K and Cl=ionic bond
H and O = covalent bond
Al and Mg= covalent bond
K and Na= covalent bond

### Re: How to tell which elements will be most likely to form a covalent bond

Posted: Sun May 20, 2018 3:03 pm
Since a difference greater than 2 forms an ionic bond and a difference less than 1.5 forms a covalent bond, what would you do if the difference in electronegativity is between 1.5 and 2?

### Re: How to tell which elements will be most likely to form a covalent bond

Posted: Sun May 20, 2018 6:21 pm
usually a metal and nonmetal forms ionic bond, other circumstances usually form covalent bonds

### Re: How to tell which elements will be most likely to form a covalent bond

Posted: Sun May 20, 2018 6:31 pm
how do we determine if its polar covalent

### Re: How to tell which elements will be most likely to form a covalent bond

Posted: Sun May 20, 2018 6:39 pm
Ionic bonds are usually created by a metal and a non metal! It is usually a good rule of thumb.

### Re: How to tell which elements will be most likely to form a covalent bond

Posted: Sun May 20, 2018 10:00 pm
Jocelyn Fermin1J wrote:
Alicia Yu 1A wrote:If you're given a list of elements such as
K and Cl
H and O
Al and Mg
K and Na
how do you tell which elements will most likely form a covalent bond?

These are the bonds I got after doing the calculations, Please correct me if I am wrong!
K and Cl=ionic bond
H and O = covalent bond
Al and Mg= covalent bond
K and Na= covalent bond

I got the same answers - looks good.