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

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Alicia Yu 1A
Posts: 30
Joined: Thu Feb 22, 2018 3:02 am

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

Postby Alicia Yu 1A » 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?

Kara Justeson 1B
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

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

Postby Kara Justeson 1B » 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!

Luis Torres 1C
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

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

Postby Luis Torres 1C » 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.

Jocelyn Fermin1J
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Joined: Tue Nov 14, 2017 3:01 am

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

Postby Jocelyn Fermin1J » 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

Jada Larson 1F
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

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

Postby Jada Larson 1F » 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?

Hongtao Yao
Posts: 18
Joined: Fri Apr 06, 2018 11:05 am

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

Postby Hongtao Yao » Sun May 20, 2018 6:21 pm

usually a metal and nonmetal forms ionic bond, other circumstances usually form covalent bonds

QuincyH1G
Posts: 17
Joined: Mon Apr 09, 2018 1:40 pm
Been upvoted: 1 time

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

Postby QuincyH1G » Sun May 20, 2018 6:31 pm

how do we determine if its polar covalent

Bijal Luhar
Posts: 33
Joined: Fri Apr 06, 2018 11:03 am

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

Postby Bijal Luhar » 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.

Nimrat Brar 1E
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Joined: Fri Apr 06, 2018 11:02 am
Been upvoted: 1 time

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

Postby Nimrat Brar 1E » 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.


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