Talk:Diatomic molecule

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[edit] Molecular Geometry Section

This is crucial for completing the set on Molecular Geometry. Because several admins thought that it was not proper to have its own page, it was moved to here. Please do not delete. Jokermole (talk) 15:43, 21 January 2008 (UTC)

Completing a set about which there's no agreement that it should exist at all? Please discuss it at Wikipedia talk:WikiProject_Chemistry#Geometry_boxes_-_what_gives.3F to avoid duplicating the discussion. --Itub (talk) 15:46, 21 January 2008 (UTC)

The section now reads:-

"The Linear N/A molecular geometry in chemistry describes the stereochemistry (spatial arrangement of atoms) that is adopted by diatomic molecules [1]. This configuration is more commonly referred to in the VSEPR theory as the AX1E* [citation needed]. Due to the fact that 2 atoms are equally bonded to each other, there is no central atom[2][3]."

Perhaps it would be better if it read something like:-

"The diatomic molecule molecular geometry is the simplest spatial arrangement of atoms.[4]. This configuration is more commonly referred to in the VSEPR theory as the AX1E* [citation needed]. Unlike other systems in VSEPR, there is no central atom.[5][6]"

What do others think? I did not check the references so perhpas other chnages will be needed. --Bduke (talk) 23:00, 21 January 2008 (UTC)

I'm all for it. Whatever you suggest is fine. It just needs editing. Jokermole (talk) 00:44, 22 January 2008 (UTC)

[edit] Miscellaneous

is sulfur, selenium, or tellurium a diatomic molecule in the atmosphere

If atoms in a diatomic molecule are not chemically bonded, what is the link between them?

S, Se, & Te don't (at least normaly) form diatomic molecules. S in the atmosphere is as SO2, SO3, H2S, or sulfate aerosols. And diatomic molecules are held together with single, double or triple covalent bonds. -Vsmith 15:53, 20 Apr 2005 (UTC)

[edit] Mono, di, tri, tetra, penta, hexa, hepta and octatomic elements and molecules

I was wondering if we should combine these in some way, as some of the articles are probably going to be pretty short. Each of them has at least two meanings. For example, a "tetratomic molecule" is one with four atoms and a "tetratomic element" is an element that forms a molecule with four atoms of that element. If they are combined, what should the article be named? "Mono and polyatomic elements and molecules"? -- Kjkolb 11:21, 26 November 2005 (UTC)

Please could we have a derivation for the ratio of specific heats for a diatomic ideal gas?

We really need a table of heteronuclear diatomic molecules, but I wasn't able to find one. ([1]) — Enigma55 (talk • email) 05:20, 29 May 2007 (UTC)

[edit] Nonsense: Comparison between rotation and vibration

"The lowest rotational energy level is when l = 0."

Um, OK.

Erot,0 = l*(l+1)*hbar**2 / (2*I) = 0 * (0+1) hbar**2 / (2*I) = 0

Not sure how that one got screwed up.

DrF 23:11, 15 August 2006 (UTC)

[edit] Harmonic oscillator?

Erm.

"exactly the same as a harmonic oscillator" - no, it isn't. The vibration of a diatomic molecule is anharmonic and more closely follows the Morse potential than the parabolic well. The article on the morse potential actually links to this one.

[edit] Natural occurrence

The latest addition to the article says that "only a few diatomics are found to be naturally-occurring on Earth. These are hydrogen (H2), nitrogen (N2), oxygen (O2), and the halogens: fluorine (F2), chlorine (Cl2), bromine (Br2), iodine (I2), and astatine (At2)". I'm not sure this list is correct. N2 and O2 are certainly correct, but the halogens (especially fluorine!) are so reactive that they are normally found only in compounds. The same might be the case for H2. On the other hand, it should be possible to find some heteronuclear diatomic molecules in nature: NO has a biological role, and can be formed directly in the atmosphere by lightning; CO is a product of incomplete combustion, which can also occur naturally. --Itub —The preceding signed but undated comment was added at 15:42, August 24, 2007 (UTC).

You're right, the phrase "naturally occurring" is wrong. Let's see if we can find a correct way to say it. What I intended was something along the lines of "reasonably stable near 298 K and 1 bar pressure", but that's a lot of words. Something is needed that covers CO, HX, where X = a halogen, and perhaps more. I'll try again if someone else doesn't get there first. Maybe just restrict the sentence(s) to elemental diatomics? - Astrochemist 20:25, 24 August 2007 (UTC)
I tried to correct my earlier edit, so please check it when you have time. By the way, is it worth mentioning that the translational energy of a molecule is also subject to quantum mechanics? - Astrochemist 01:05, 25 August 2007 (UTC)
It looks good now. I see no problem mentioning the quantum translational energy. By the way, thanks for creating the article about the Karlsruhe Congress! --Itub 05:35, 27 August 2007 (UTC)

[edit] Astatine

I'm removing the comments anonymously added today about astatine since they are not in a wiki format. As to their content, Emsley's book has redox potentials involving diatomic astatine. Are they measured or calculated ones? There are web pages giving astatine compounds, but I don't know of unequivocal statements about At2. The web page here seems reliable and gives some indirect evidence for At2. Another question to ask concerns the evidence that astatine is not diatomic. Can anyone shed light on this one way or the other? - Astrochemist 00:09, 15 September 2007 (UTC)

See also this page from Handbook of Inorganic Chemicals (2003), Pradyot Patnaik, McGraw-Hill: London, p. 76. - Astrochemist 00:09, 15 September 2007 (UTC)