Hi Anabel, PF6- does have polar bonds, but because it is symmetrical it is actually a non-polar molecule. The cut off for polar/ionic bonds is somewhat arbitrary and varies depending on the source you look at, generally ranging from 1.7 to 2. The details of this are complicated, but it has to due with electronegativity values being approximations. Like many things in chemistry, it is an extremely useful simplification that won't always be right...but its much easier than solving a physics problem for each bond haha.
Hi Shad, The symmetry question can be challenging! I have a whole video on just this aspect of molecular polarity. Check it out here: th-cam.com/video/nmssiDwyUno/w-d-xo.html
With the C-H bond the electronegativity difference is 0.4 so the bond is slightly polar polar and should be taught as such. Technically only a 0 difference is non-polar.
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Thanks man great Help
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Thanks!
thank you so much for this, I have been really struggling with this concept!
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Thank you very helpful
This helped me so much, thank you!
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Thank you so much! You are so good at explaining things
I ionic also polar because for PF6 you considered 1.9 as polar which is ionic
thank you very much sir.
Re the lewis dot for PF6. I tried drawing this and thought it would be 23 pairs +1e….so did I go wrong or are you drawing [PF6]- ?
Hi josh, how come PF6 is polar covalent when the difference in EN is 1.9? shouldn't it be ionic? Thanks.
Hi Anabel,
PF6- does have polar bonds, but because it is symmetrical it is actually a non-polar molecule. The cut off for polar/ionic bonds is somewhat arbitrary and varies depending on the source you look at, generally ranging from 1.7 to 2. The details of this are complicated, but it has to due with electronegativity values being approximations. Like many things in chemistry, it is an extremely useful simplification that won't always be right...but its much easier than solving a physics problem for each bond haha.
I love your videos 😉
So it doent matter if there is a high electronegativity when you calculate the differences of the atoms?
That matters, but is only 1/2 of the requirement! If it is also asymmetrical, then it would be polar.
does not NH3 is a Symetrical triangolar pyramidal ?
i did not understand what you said for explaining
Hi Shad,
The symmetry question can be challenging! I have a whole video on just this aspect of molecular polarity. Check it out here: th-cam.com/video/nmssiDwyUno/w-d-xo.html
With the C-H bond the electronegativity difference is 0.4 so the bond is slightly polar polar and should be taught as such. Technically only a 0 difference is non-polar.
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