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From: maxwell on 17 Feb 2010 10:51
On Feb 16, 9:32 am, Occidental <Occiden...(a)comcast.net> wrote:
> Are there any elements for which the orbital velocity of electrons is
> a significant fraction of the velocity of light?

No
From: maxwell on 17 Feb 2010 10:52
On Feb 16, 9:44 am, dlzc <dl...(a)cox.net> wrote:
> Dear Occidental:
>
> On Feb 16, 10:32 am, Occidental <Occiden...(a)comcast.net> wrote:
>
> > Are there any elements for which the orbital
> > velocity of electrons
>
> Whatever that means to an electron cloud...
>
> > is a significant fraction of the velocity
> > of light?
>
> http://www.desy.de/user/projects/Physics/Relativity/SR/gold_color.html
>
> David A. Smith

The 'electron cloud' view is the result of statistical sampling. No
one has ever seen or measured an electron cloud - only point particles.
From: glird on 17 Feb 2010 11:52
On Feb 16, 12:32 pm, Occidental <Occiden...(a)comcast.net> wrote:
> Are there any elements for which the orbital velocity of electrons is
> a significant fraction of the velocity of light?

Probably in all of them, in the outermost "valennce bond" layer.
(In hydrogen atoms the electrons orbital speed is
c' = cFs = 2.1876923 x 10^8 cm/sec,
in which Fs denotes the Fine Structure Constant.)
To those who disagree, note that the numerical value
of Planck's quantum of action is precisely
h = 2pirmc', in which m is the weight of an electron and
r is the radius of its orbital path in an H atom.

glird
From: dlzc on 17 Feb 2010 12:09
Dear maxwell:

On Feb 17, 8:52 am, maxwell <s...(a)shaw.ca> wrote:
> On Feb 16, 9:44 am,dlzc<dl...(a)cox.net> wrote:
> > On Feb 16, 10:32 am, Occidental <Occiden...(a)comcast.net> wrote:
>
> > > Are there any elements for which the orbital
> > > velocity of electrons
>
> > Whatever that means to an electron cloud...
>
> > > is a significant fraction of the velocity
> > > of light?
>
> >http://www.desy.de/user/projects/Physics/Relativity/SR/gold_color.html
>
> The 'electron cloud' view is the result of
> statistical sampling.  No one has ever seen
> or measured an electron cloud - only point
> particles.

The "electron cloud" has been observed using atomic force microscopy
and more:
http://dcmp.bc.edu/page.php?name=gallery#ADATOM
.... note this is not truly in contradiction to what you have said,
since AFM (and other imaging methods) requires a host of sample points
for a single image, and this is tantamount to your "statistical
sampling".

David A. Smith
From: BURT on 17 Feb 2010 15:22
On Feb 17, 9:09 am, dlzc <dl...(a)cox.net> wrote:
> Dear maxwell:
>
> On Feb 17, 8:52 am, maxwell <s...(a)shaw.ca> wrote:
>
>
>
>
>
> > On Feb 16, 9:44 am,dlzc<dl...(a)cox.net> wrote:
> > > On Feb 16, 10:32 am, Occidental <Occiden...(a)comcast.net> wrote:
>
> > > > Are there any elements for which the orbital
> > > > velocity of electrons
>
> > > Whatever that means to an electron cloud...
>
> > > > is a significant fraction of the velocity
> > > > of light?
>
> > >http://www.desy.de/user/projects/Physics/Relativity/SR/gold_color.html
>
> > The 'electron cloud' view is the result of
> > statistical sampling.  No one has ever seen
> > or measured an electron cloud - only point
> > particles.
>
> The "electron cloud" has been observed using atomic force microscopy
> and more:http://dcmp.bc.edu/page.php?name=gallery#ADATOM
> ... note this is not truly in contradiction to what you have said,
> since AFM (and other imaging methods) requires a host of sample points
> for a single image, and this is tantamount to your "statistical
> sampling".
>
> David A. Smith- Hide quoted text -
>
> - Show quoted text -

There is no double cloud. The electron sits inbetween the atoms
creating the bond.

Mitch Raemsch
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