Ionic bonding question about "double" ionic bonds

  • #1
Is a "double" ionic bond (the transfer of two electrons) like in MgO any stronger (or really any different, structurally etc.) than a "single" ionic bond (the transfer of one electron) like in NaCl?
 

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  • #2
chemisttree
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Yes it is. Doubling the ionic charge nearly quadruples the bond energy.
 
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  • #3
Borek
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Ionic bonds are mostly about simple Coulomb forces, these are quite easy to estimate with

[tex]F = k\frac{q_1q_2}{r^2}[/tex]

Just try to put what you wrote into the equation and you will see where @chemisttree answer comes from.
 
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  • #4
Is it possible then to make NaCl with a double ionic bond by combining in a lab Cl+ and Na-? Does this compound exist and if so what is it called (how to differentiate from normal NaCl)?
 
  • #5
Borek
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No, you can't make a double bond out of single charged ions.

And you can't ionize Na nor Cl further - that is, in some exotic conditions you can, but when you combine them the Na2+ will steal an electron from Cl2- and they will live happily ever after in their local energetic optimum.
 
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  • #7
No, you can't make a double bond out of single charged ions.

And you can't ionize Na nor Cl further - that is, in some exotic conditions you can, but when you combine them the Na2+ will steal an electron from Cl2- and they will live happily ever after in their local energetic optimum.
Sorry, one more question. o_O

What reaction would occur between Cl2 and a Na-? Would a Cl atom steal an electron from Na, making Cl- + NaCl? Or would the Na- create an ionic bond with both Cl atoms creating a structure similar to MgCl2?
 
  • #8
Sorry, one more question. o_O

What reaction would occur between Cl2 and a Na-? Would a Cl atom steal an electron from Na, making Cl- + NaCl? Or would the Na- create an ionic bond with both Cl atoms creating a structure similar to MgCl2?

Actually, I was able to find both compounds here:

https://pubchem.ncbi.nlm.nih.gov/compound/22590707

https://pubchem.ncbi.nlm.nih.gov/compound/57736105

So, what makes the difference between which of these compound structures is formed, or are they the same thing?
 
  • #9
Borek
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Sodium dichloride (assuming it exists) is not Na- + Cl2, if anything, I would treat it as Na+ + 2Cl-.
 
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