Silicon dioxide

[Gilded]

Talking about fluorides of xenon, have they been able to make solid at room temp. molecules of all noble gases? All I know of is some sort of lithium-krypton compound (kryptonite ).

[budullewraagh]

impossible; you cant reduce krypton

[5614]

unless you added a whole new 'ring' of electrons, but as far i know that is impossible.

[pulkit]

Actually all these compounds involve the noble gas atoms getting stuck in the cavities of the crystal structure of another element. Not sure but I think they call them inter-stitial compounds - such things are unstable thermally and I think the gas Aron is only known to participate in a few such compounds and nothing else. In that way xenon flourides are way more stable, but then xenon is a bigger atom with empty d-shells.

[Gilded]

I see. Maybe it was an inter-stitial formation, or then I had been sniffing terpentine again. :<

[Primarygun]

thanks. why is fluorine gas is still so reactive?

Isn't it stable? with a stable octet/.

[Gilded]

It has 7 electrons on its outer orbit, making it a big mean electron stealing machine like chlorine.

[pulkit]

thanks. why is fluorine gas is still so reactive?

Isn't it stable? with a stable octet/.

 

There is a difference between stability and reactivity. Flourine may be reactive but it is stable.

[Gilded]

I think he meant that it's stable when mixed with other elements, stable like noble gases are; highly inert and non-reactive. Of course, usually when talking about stability it's the matter of the discussed element being radioactive or not.

[5614]

if an element is not stable it means if will decay [through radiation]

and a stable atom will not decay.

 

a reactive element has a big reaction when mixed e.g. sodium, potassium

a non-reactive element will not react with other materials e.g. noble gases e.g. neon, xenon & krypton

[Gilded]

Yep. That pretty much clears it for those who had no idea whatsoever. :> If someone wonders "wtf is a decay through radiation" see the radioactive isotope-thread.

[5614]

yes, i dont think there are that many people who dont know the difference, i think even most of the 14 year old [lots of em round] know that, or at least, i think they would if they were in england and at school.

 

going back to the subject, there wasnt really one, but anyway:

 

about reducing a noble gas, is it possible, i know you cant have another electron in the outter shell, but could a new shell be added somehow?

[budullewraagh]

im quite sure it cant

[Gilded]

"impossible; you cant reduce krypton"

 

Then howcome krypton fluoride has been made? It's even solid in room temp, though not very stable. I think it's used in lasers.

[YT2095]

I`ve heard of Xenon Fluoride, but never Krypton Fluoride (yet).

 

got any data on it?

[Gilded]

Not much.

 

http://www.mellesgriot.com/glossary/wordlist/glossarydetails.asp?wID=175

 

About a laser that uses it.

[YT2095]

neat, this is the best I can do also: http://www.webelements.com/webelements/compounds/text/Kr/F2Kr1-13773814.html

 

again, not much, and no Synth data provided, but a good start

[Gilded]

Ah yes, why didn't I think about WebElements, they have a compound of just about every element.

 

KrF2 has a nice crystal structure, it seems.

[YT2095]

Indeed

 

I`ve had no luck looking up it`s CAS registry number though?

[Gilded]

So, now we know krypton and xenon can be in forms of compounds. But can helium, argon, neon or radon? From what I've read, they can't.

[YT2095]

it`s probably to do with the nuclear forces keeping the outermost electrons in check, you`ll probaly find that Radon will be cappable of even more compounds than Krypton is, and that Helium would be almost impossible to react with.

 

just an educated guess

[jdurg]

Every single electron shell exists for every single atom out there. Even Helium has a 9s shell. However, those shells just aren't in use. An electron "shell" isn't a physical object. It's a mathematic probability that an electron with a certain level of energy will exist in that area. This is where you get into the quantum mechanics junk that can make grown men cry. All of the noble gasses can be reduced, it just takes a good deal of energy to do that. Helium is virtually inert since the amount of energy required to either add an electron, or remove an electron from it and place it into a bond is obscenely high.

[YT2095]

same point, better worded

[pulkit]

Argon is only known to participate in inter-stitial compounds. It is not involving any chemical change but only a physical change as far as compound formation is concerned. Helium does not form anything. Xenon that way is very nice because of its stable flourides.

[Primarygun]

My teacher said that carbon compounds tend to have molecular structure but silicon compounds tend to have giant covalent structure. How to explain it and is the compound consist with germanium all get the giant covalent structure?