• Support PF! Buy your school textbooks, materials and every day products Here!

Why are noble gases, gases?

  • Thread starter gateman234
  • Start date
11
0
[SOLVED] why are noble gases, gases?

1. Homework Statement
this has bothered me for some time,
what determines the density of an element at normal atmoshpheric conditions?
and more importantly what determines if a substance at s.t.p is a gas solid or liquid

2. Homework Equations

gas laws, maybe?

3. The Attempt at a Solution

i was thinking there might be some repulsion and atractions between atoms, like with Ar it contains a full outer shell which means to gain more electrons it would require a new level which would take alot of energy, compared to Sulfur which is trying to complete a full outer shell, which reqiures less energy. so there is more atractration between atoms.
this only can aply for some atoms, help?
 

Answers and Replies

have you done anything on the different types of intermolecular force yet? If so, you will easily realise partly why the noble gases are, in fact, gases. The "density" of an element is a bit of a funny thing to be talking about, because in gas terms we generally don't talk about density in the same way (we don't say there is so many kg/m^3 of argon, we say there are so many ppm or ppb.
Looking at your posts so far it seems you have phrased everything only in terms of electron shells. Admittedly I find that just about all chemistry (apart from physical chemistry) can be explained by electron shells (hence why I'm more of a physicist), but maybe you should wait a little while and things will become clearer to you.

In argon, and indeed any element you have only weak van der waals forces between particles, so that's why most of the non-metals are in fact gases, until you get up to really heavy stuff.

Attraction and repulsion between atoms has absolutely nothing to do with how hard they are "trying to complete a shell". If you want to understand more, look up intermolecular forces and how they work. It should be very soon part of your chemistry course.

And finally, re your other post, this should definitely be in the chemistry subforum.
 
11
0
ok, thanks for your time.
 

Related Threads for: Why are noble gases, gases?

Replies
3
Views
1K
  • Last Post
Replies
4
Views
31K
  • Last Post
Replies
1
Views
939
  • Last Post
Replies
2
Views
5K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
7
Views
2K
  • Last Post
Replies
8
Views
4K
Top