21 December 2019 6 7K Report

In chemistry and physics what are "atomic orbitals" actually USED for?

"In atomic theory and quantum mechanics, an atomic orbital is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus." (en.wikipedia.org/wiki/Atomic_orbital)

"In chemistry, a molecular orbital (MO) is a mathematical function describing the wave-like behavior of an electron in a molecule. This function can be used to calculate chemical and physical properties such as the probability of finding an electron in any specific region." https://en.wikipedia.org/wiki/Molecular_orbital

These articles are about the probability of finding an electron. There have impressive diagrams illustrating spherical harmonics, drum membrane oscillation modes, shapes of orbitals, subshell filling rules, etc. There are wave equations, hydrogen-like single electron atoms, Hartree-Fock approximations for multi-electron atoms, etc. . . .

We are told (variously) that the:

electronic structure of neon is: 1s22s22px22py22pz2 or 1s22s22p6

electronic structure of potassium is: 1s22s22p63s23p64s1

electronic structure of barium is: 1s22s22p63s23p63d104s24p64d105s25p66s2.

Why should I care? Why is this taught to freshmen in college chemistry?

After being impressed by all the pictures of orbital shapes, I then read this:

"Although individual orbitals are most often shown independent of each other, the orbitals coexist around the nucleus at the same time. Also, in 1927,Albrecht Unsöld proved that if one sums the electron density of all orbitals of a particular azimuthal quantum number l of the same shell n (e.g. all three 2p orbitals, or all five 3d orbitals) where each orbital is occupied by an electron or each is occupied by an electron pair, then all angular dependence disappears; that is, the resulting total density of all the atomic orbitals in that subshell (those with the same l) is spherical. This is known as Unsöld's theorem." (https://en.wikipedia.org/wiki/Atomic_orbital )

Does any of this have any practical use other than to pass a test or impress your professor or girl friend? This "knowledge" just does not seem to connect with anything. The concern over "finding an electron" seems like a pathological compulsive/obsessive disorder.

In my view, "electron energy levels" could simply be "energy levels within the atom"--and having nothing fundamentally to do with badly misbehaving electrons.

It all reminds me of a joke I heard on TV: "Does Superman have a super sense of humor or just an ordinary sense of humor?" Of course, we need a grant to study the issues here. The sense of humor might be related to diet. What does Superman eat? How do you define "super sense of humor"? etc., etc., etc. But after all the studies are done and all the money is spent, WHO CARES? This is useless "knowledge".

Two engineering firms were trying to "out spec" each other on their quality programs. One was bragging about 8 sigma quality, the other, 6 sigma quality. But the bottom line proved to be: "The quality that we don't have is BETTER than the quality that you don't have either." This is a distinction without a difference--nothing meaningful.

Is all this s,p,d,f orbital stuff simply mathematical circumlocution for our amusement? A horror movie based on Schrodinger's mathematical "maps of Hell" ? Could we learn just as much by getting drunk and watching a really stupid grade B movie on TV?

Of what USE is this so called "knowledge". If someone knows, PLEASE let him speak up! Please enlighten us!

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