

Subject:
Diameter of cadmium atom in Angstroms
Category: Science Asked by: patrice29ga List Price: $5.00 
Posted:
03 Aug 2006 14:48 PDT
Expires: 02 Sep 2006 14:48 PDT Question ID: 752302 
What is the diameter of a cadmium atom in Angstroms? This may or may not be an odd unit of measurement for atomic sizes, but I'm trying to get an idea of the relative size between the two. An angstrom equaling 1 x 108 centimeters, which would equal routhly .00000004 inches (if my math isn't too shot). Please correct any errors. Thanks, Patrice 

Subject:
Re: Diameter of cadmium atom in Angstroms
Answered By: liviofloresga on 04 Aug 2006 00:08 PDT Rated: 
Hi!! Let me start with the following definitions: The atomic radius is the distance from the atomic nucleus to the outmost stable electron orbital in an atom that is at equilibrium and it is measured in picometers or angstroms. The van der Waals radius of an atom is the radius of an imaginary hard sphere which can be used to model the atom. For the Cadmium the above values are (in picometres pm): Atomic radius (empirical) > 155 pm Atomic radius (calculated) > 161 pm Van der Waals radius > 158 pm For practical purposes you can consider the Cadmium atom diameter as twice the Van der Waals radius, that is: Cadmium atom diameter > 2*158 pm = 316 pm Since each Angstrom is equivalent to 100 pm we have that: Cadmium atom diameter > 316 pm = 3.16 A aprox. For references see: "Atomic radius  Wikipedia, the free encyclopedia": http://en.wikipedia.org/wiki/Atomic_radius "Van der Waals radius  Wikipedia, the free encyclopedia": http://en.wikipedia.org/wiki/Van_der_Waals_radius "Chemistry : Periodic Table : cadmium : radii": http://www.webelements.com/webelements/elements/text/Cd/radii.html "Cadmium  Wikipedia, the free encyclopedia": http://en.wikipedia.org/wiki/Cadmium Search strategy: cadmium "atomic radius" I hope this helps you. Do not hesitate to request for a clarification if you need it before rate this answer. Regards, liviofloresga 
patrice29ga
rated this answer:
and gave an additional tip of:
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Interesting, thorough answer. Thanks, Patrice. 

Subject:
Re: Diameter of cadmium atom in Angstroms
From: liviofloresga on 04 Aug 2006 18:37 PDT 
Dear patrice29, thank you so much for the good rating and comments, and of course for the generous tip. 
Subject:
Re: Diameter of cadmium atom in Angstroms
From: neilzeroga on 12 Aug 2006 18:41 PDT 
As far as I know the answer is correct including "Since each Angstrom is equivalent to 100 pm" An anstrom = 108 centimeters = 1010 meters A picometer is 1012 meters 100 picometers = one angstrom unit 
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