alphaQuad nous apporta ses lumieres en ce 2007/08/25 12:23:
> haichen,
> 
> Thank you for that effort but it seems I need to know where you found this
> data, something more than a domain.
> 
> 
> Almost everything but the last row:
>
http://www.webelements.com/webelements/properties/text/image-flash/atomic-radius.html
> 
> And no sanity seems to exist there as you can never tell what to expect to
> appear after a click.
> Back button brings up different charts, etc than what was there previously.
> (heinous indeed)
> 
> Pr Atomic radius (empirical) [/pm]: 185
> Ac Atomic radius (empirical) [/pm]: 195
> U Atomic radius (empirical) [/pm]: 175
> Ho Atomic radius (empirical) [/pm]: 175
> 
> I find a descrepancy and do not see U or Ac. Can you account for the
> descrepancy of Pr and which is the actual value? (Where are all of them?
> preferably in some text format that can be read.)
> 
> Pr 247
No discrepancy.
> Nd 206
> Pm 205
Those 2 looks to small, but it should be OK.
> Sm 238
> Eu 231
A little small.
> Gd 233
Still small
> Tb 225
> Dy 228
A little big
> Ho 226
> Er 226
> Tm 222
> Yb 222
> 
> Hopfully, with some assistance, there will be a new and better periodic in
> this thread soon.
> 
> 
> 
> 
The lantanoids and actinoids are particuliar in that the orbitals and sub 
orbitals are not filled sequentialy. In the rest of the groups, the various sub 
orbitals receive 1 electron each before any get a second one. S receive 1, then 
P receive 3, one per axis, then S receive the second, then the rest of P is filled.
This sequance breaks down with the frouth orbital order. More paired electrons = 
smaler atomic radii.

-- 
Alain
-------------------------------------------------
At the feast of ego everyone leaves hungry.
	Bentley's House of Coffee and Tea, Tucson, AZ

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