h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Hi Iridium,

I've subbed the first of the two entries, "Valence Bond Theory of Chemical Bonding". It's at A1011871 - can you read through it and let me know if there's anything that needs to be corrected before I return the entry?


RhoMuNuQ

I've now also subedited the second entry, 'Molecular Orbital Theory of Chemical Bonding' at A1011899. Can you take a look at that one as well?


RhoMuNuQ

Thanks Rho! I like what you done with a few sentences here and there, really clarifies a few point well. Right, okay, some small typos of mine that I've spotted:
1) In VB there's a typo in the third paragraph "...while the electrons moves around them.",
2) there should be an 's' on the end of eletcron in the sentence after the mention of the Pauli exclusion principle,
3) in the para after the A(1)B(2) + A(2)B(1) eqaution an 'a' needs removing from "...becomes very small there is a then a sharp increase in the energy"
4)There needs to be an 's' on the end of the first orbital in "Mixed orbital derived from the atomic orbitals on the same atom..." in the second paragraph in the "Promotion and Hydbridisation" section
5) in the third paragraph in the same section nuder the four equations, the first line ends "...centred on the nucleus being produced" and should end "...centred on the nucleus of the carbon atom"
6) I think I've made a slight mistake in the second equation in the resonance section describing the wavefunction for purely ionic HCl, I think it should read "psi"ion = "psi"Clpz(1)"psi"Clpz(2), will get back to you on that one to confirm it. I'll also get back to you later about MO theory

Cheers Rho!

Hi Rho! Some points for MO theory
1)In the paragraph right after the title "Bonding and Antibonding Combinations of Atomic Orbitals" the sentence "When forming a bond in VB theory, we take two wavefunctions, one for unpaired electrons in atomic orbitals on atoms 'A' and 'B' and form one VB wavefunction" should read "When forming a bond in VB theory, we take two wavefunctions, one for each unpaired electron in the atomic orbitals on atoms 'A' and 'B' and form one VB wavefunction"
2) At the very end of same the paragraph there should be an 's' on the end of the word wavefunction
3)In the equation for sp mixing after the subheader "Second Row Diatomic Molecules." the (B) in the first term should be (A)
4)In the prargraph after this equation the '2s' in the sentence "For the molecular orbitals 3σ and 4σ*, close in energy to the 2s orbitals..." should be a '2p'
5) "Why don't we form molecular orbitals by overlapping an s orbital with a px? s (and pz) orbitals in diatomic molecules are cylindrically symmetrical along the internuclear axis, whereas the px and py each have a plane of symmetry" in 5th paragrph of the same section should read as "Why don't we form molecular orbitals by overlapping an s orbital with a px or py orbital? The s (and pz) orbitals in diatomic molecules are cylindrically symmetrical along the internuclear axis, whereas the px and py each have a plane of symmetry."
6) Since I mention a figure for the F-F bond strength maybe a figure for the very strong NN bond wouldn't go amiss (942 kJ mol^-1)

Sorry, I should have spotted some of these before submitting them for review in the first place,
Anyway, thanks for subbing them

Iridium! I'll make those changes very soon...

RhoMuNuQ

I've made both sets of changes. If correction (6) for A1011871 needs to be made, let me know.

RhoMuNuQ

Morning Rho
Yep, (6) for VB theory does need doing. It should read:

'psi'ion = 'psi'Cl2pz(1)'psi'Cl2pz(2)

Cheers

I've made that change, too.

RhoMuNuQ

Hi folks

Iridium, I'm doing some diagrams for this entry and I'd appreciate it if you could have a look at them and check them. They're currently at http://uk.briefcase.yahoo.com/bc/mavzb/lst?&.dir=/h2g2/Molecular+Orbital+Theory&.src=bc&.view=t although yahoo does change the resolution slightly.

Are they factually correct? I did a bit of research before starting, and found a few diagrams on the web - there were some differences to the ones you'd done, and this is a subject I know nothing about! I've kept the labels the same, but are all the arrows and things right?



J

Yeah, cool, they look okay to me. You will find differences depending on where you look, extra subscript 'u' and 'g' labels and that sort of thing and different ways of presenting the diagrams. So those will replace my table drawings? They'll look more effective, couldn't figure out how to get linking lines between atomic and molecular orbitals without making it look naff, cheers.

Yep, these will be used in place of your table drawings. I don't think you would have been able to get the linking lines in anyway...

Actually, are those black line borders part of the picture and therefore be in the entry. If possible, can the diagrams to be borderless?

Yeah, the borders are part of the picture. I always think it looks a little odd without the border - it's almost as if the actual diagram is just floating.

Plus I sent the diagrams to the Editors just 20 minutes ago... though I'm sure they'd accept new versions if you're realy desperate.

Just personal preference, if they've already gone off then it'll probably cause too much hassle to sort out

Hi guys, have had a look at the updated version of MO theory, top notch job! Thanks

Naughty editors. They made the changes before I returned the entry - maybe they're trying to tell me something?

RhoMuNuQ

Iridium,

I've returned the entries and am going to be offline for the next week-and-a-half. If you spot any mistakes in either entry, post in <./>Feedback-Editorial</.> asking for the correction to be made.

RhoMuNuQ

Cheers Rho If you're on holiday, have a good time. See you when you get back

I am on holiday, but that's no reason to stop you from seeing me before I get back.

RhoMuNuQ