Which compounds are isoelectronic with CN-?

  • Thread starter guiromero
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In summary: They all have the same number of electrons (10) and similar structures with triple bonds. However, the answer may vary depending on the specific definition of isoelectronicity being used.
  • #1
guiromero
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Hello,

I have a question about isoelectronicity from an MIT course:

Select each compound below that is isoelectronic with CN-.
a)O2 2- b)NO+ c)HF d)ClO- e)NO f)CO

My guess would be CO, because it's the only compound that has a triple bond.
Can anyone confirm if my guess is correct?

Thank you.
 
Last edited:
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  • #2
guiromero said:
The problem is that the "Show Answer" button is not working.
Not the solution you are looking for, but:

In the past several months there is a new version of HTML and its associated features that has appeared on the Internet--- and many older browsers don't know what to do with those pages; buttons and features that don't work have become rather common!

Up until 6 months ago I was using a browser released in 2015 that suddenly didn't work here on PhysicsForums... I was forced to upgrade (and lose a bunch of functionality). :oldfrown:

The problem is spreading and even the upgrade has trouble with some sites now.

So it seems you are at the front-end of needing a browser upgrade. I hope you can find one that is not TOO obnoxious!

Oh! And :welcome:

Cheers,
Tom
 
  • #3
Tom.G said:
Not the solution you are looking for, but:

In the past several months there is a new version of HTML and its associated features that has appeared on the Internet--- and many older browsers don't know what to do with those pages; buttons and features that don't work have become rather common!

Up until 6 months ago I was using a browser released in 2015 that suddenly didn't work here on PhysicsForums... I was forced to upgrade (and lose a bunch of functionality). :oldfrown:

The problem is spreading and even the upgrade has trouble with some sites now.

So it seems you are at the front-end of needing a browser upgrade. I hope you can find one that is not TOO obnoxious!

Oh! And :welcome:

Cheers,
Tom
Thanks for your help. But in this case, it's because the due date of the lesson has already passed.
 
  • #4
What does "isoelectronic" mean?

(and no, it is not only CO, having triple bond is not the condition you are looking for)
 
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Likes guiromero
  • #5
A molecule is isoelectronic with another if both have the same structure (positions and connectivities among atoms) and same electronic configurations, but they differ by what specific elements are at certain locations in the structure.

I firstly didn't realize that NO+ has a triple bond, I thought it had a double bond instead. That's why I thought the answer was only CO.

In this case, I think the answer would be NO+ and CO, because both of them have triple bonds and 10 electrons, alike CN-.

Do you think my assumption is correct?
 
Last edited:
  • #6
Yes, NO+, CO and CN- are isoelectronic.
 

Related to Which compounds are isoelectronic with CN-?

1. What does it mean for a compound to be isoelectronic with CN-?

Isoelectronic compounds have the same number of electrons and the same electronic structure. For CN-, this means finding other species that have the same total number of electrons and similar arrangements.

2. How many electrons does CN- have?

CN- has a total of 14 electrons. Carbon (C) has 6 electrons, nitrogen (N) has 7 electrons, and the extra negative charge adds one more electron, totaling 14.

3. Which neutral molecules are isoelectronic with CN-?

Neutral molecules that are isoelectronic with CN- include CO (carbon monoxide) and N2 (nitrogen gas). Both of these molecules also have 14 electrons.

4. Which anions are isoelectronic with CN-?

Anions that are isoelectronic with CN- include NO- (nitrosyl anion) and BO2- (borate anion). These anions also have 14 electrons.

5. Which cations are isoelectronic with CN-?

Cations that are isoelectronic with CN- include O2+ (dioxygenyl cation) and NF+ (nitrogen monofluoride cation). These cations have 14 electrons as well.

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