Sunday, August 12, 2018

physical chemistry - Atomic orbitals: how is bond strength related to stability, energy, bond length?


I have a lot of confusion regarding atomic orbitals and I don't know if what I am having in mind is even correct or not.




The bond dissociation energy of H-H is greater than that of Cl-Cl and as far as I can make out, it is because in H-H, there is an s-s overlap whereas in Cl-Cl, there is a p-p overlap. Because s-s is more compact, therefore more energy is required to break the bond.


Assuming what I wrote above to be correct, this means an s-s bond is stronger than p-p bond. But then, bond strength of p-p is more than that of s-s because of greater extent of overlap.



So there is definitely something/everything wrong in what I am thinking.


In short, how is the bond strength related to other things like stability, energy, bond length (bond length of s-s < s-p < p-p?).


Kindly help because I cannot find any of my queries anywhere else.




No comments:

Post a Comment

periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...